DEPARTMENT OF ENVIRONMENT, GREAT LAKES, AND ENERGY  
AIR QUALITY DIVISION  
AIR POLLUTION CONTROL  
(By authority conferred on the director of the department of environment, Great  
Lakes, and energy by sections 5503 and 5512 of the natural resources and environmental  
protection act, 1994 PA 451, MCL 324.5503 and 324.5512, and Executive  
Reorganization Order Nos. 1995-16, 2009-31, 2011-1, and 2019-1, MCL 324.99903,  
324.99919, 324.99921, and 324.99923)  
PART 1. GENERAL PROVISIONS  
R 336.1101 Definitions; A.  
Rule 101. As used in these rules:  
(a) "Act" means 1994 PA 451, MCL 324.5501 to 324.5542.  
(b) "Actual emissions" means the average rate, in tons per year, at which the process  
or process equipment actually emitted the air contaminant during the preceding 2-year  
period and which was representative of the normal operation of the process or process  
equipment. A different time period may be used if the time period can be demonstrated  
to be more representative of normal operation. Actual emissions shall be calculated using  
the process's or process equipment's actual operating hours, production rates, and types of  
materials processed, stored, or combusted during the selected time period. The  
department may presume that the actual emissions for a process or process equipment  
shall equal the allowable emissions for such process or process equipment if the  
allowable emissions are identified in the demonstration for an approved state  
implementation plan. For any process or process equipment that has not begun normal  
operations, actual emissions shall equal the allowable emissions. The term "actual  
emissions" is not applicable in parts 6 and 7 of these rules.  
(c) "Adhesion prime" means a coating that is applied to a polyolefin part to promote  
the adhesion of a subsequent coating. An adhesion prime is clearly identified as an  
adhesion prime or adhesion promoter on its accompanying material safety data sheet.  
(d) "Affected states" means all states that are contiguous to the state of Michigan  
and whose air quality may be affected by a proposed operating permit, operating permit  
modification, or operating permit renewal or that are within 50 miles of the stationary  
source for which a permit action is proposed.  
(e) "Air-cleaning device" means air pollution control equipment.  
(f) "Air contaminant" means a dust, fume, gas, mist, odor, smoke, vapor, or any  
combination thereof.  
(g) "Air-dried coating" means a coating that is dried by the use of air or forced warm  
air at temperatures up to 90 degrees Celsius (194 degrees Fahrenheit).  
(h) "Air pollution" has the same meaning as defined in section 5501 of the act.  
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(i) "Air pollution control equipment" means any method, process, or equipment that  
removes, reduces, or renders less noxious air contaminants discharged into the  
atmosphere.  
(j) "Air quality standard" means the concentration and duration of an air  
contaminant specified by the department or by the national ambient air quality standards  
as contained in the provisions of 40 C.F.R. part 50, adopted by reference in R 336.1902,  
whichever is more restrictive, as the maximum acceptable concentration and duration of  
that contaminant in the ambient air.  
(k) "Allowable emissions" means the emission rate calculated using the maximum  
rated capacity of the process or process equipment, unless there are legally enforceable  
limits that restrict the operating rate or the hours of operation, or both, and the most  
stringent of the following:  
(i) Any applicable standards pursuant to the clean air act.  
(ii) Any applicable emission limit specified in these rules, including a limit that has  
a future compliance date.  
(iii) Any applicable emission rate specified as a legally enforceable permit condition  
or voluntary agreement, performance contract, stipulation, or order of the department,  
including a rate that has a future compliance date.  
(l) "Alternate opacity" means that standard for density of emission which is greater  
than the standard specified in R 336.1301(1) and which is established by the department  
for a specific process or process equipment in accordance with the provisions of  
R 336.1301(4).  
(m) "Alternative method," with respect to source sampling, means a method or set of  
procedures for obtaining source samples which is not a reference test method or an  
equivalent method and which has been demonstrated, to the department's satisfaction, to,  
in specific cases, produce results adequate for a performance test.  
(n) "Ambient air" means that part of the atmosphere outside of buildings to which  
the general public has access.  
(o) "Applicable requirement" means any of the following as they apply to process or  
process equipment, including requirements that have been approved as administrative  
rules under the act pursuant to the administrative procedures act, 1969 PA 306,  
MCL 24.201 to 24.328 or promulgated by the United States environmental protection  
agency through final rulemaking at the time of issuance of a permit under the act and  
which will become effective during the permit term:  
(i) A standard or other requirement provided for in the Michigan state  
implementation plan, as approved or promulgated by the United States environmental  
protection agency through rulemaking under title I of the clean air act, that implements  
the relevant requirements of the clean air act, including any revisions to that plan  
promulgated  
in  
40 C.F.R. part 52.  
(ii) A standard or requirement enacted as a part of the act or promulgated in  
administrative rules pursuant to the act.  
(iii) A term or condition of any permit issued pursuant to the act or regulations  
approved or promulgated through rulemaking under title I of the clean air act, including  
parts C or D.  
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(iv) A term or condition of an order entered pursuant to the act that is necessary to  
ensure or demonstrate compliance with any other applicable requirement.  
(v) A term or condition of a permit issued by the United States environmental  
protection agency pursuant to title I, subpart C, of the clean air act.  
(vi) A term or condition of any permit issued pursuant to the Wayne county air  
pollution control ordinance, adopted pursuant to the home rule charter for Wayne county,  
resolution no. 85-305, as amended by resolution no. 89-213.  
(vii) A term or condition of an order entered pursuant to the Wayne county air  
pollution control ordinance, adopted pursuant to the home rule charter for Wayne county,  
resolution no. 85-305, as amended by resolution no. 89-213, that is necessary to ensure or  
demonstrate compliance with any other applicable requirement.  
(viii) A standard or other requirement under the clean air act, including any of the  
following:  
(A) A standard for the performance of new stationary sources or other requirement  
under section 111 of the clean air act, including section 111(d).  
(B) A standard for hazardous air pollutants or other requirement under section 112  
of the clean air act, including any requirement concerning accident prevention under  
section 112(r)(7).  
(C) A standard or other requirement of the acid rain program under title IV of the  
clean air act or the regulations promulgated thereunder.  
(D)  
A
requirement for enhanced monitoring established pursuant to  
sections 114 (a)(3) or 504(b) of the clean air act.  
(E) A standard or other requirement governing solid waste incineration under  
section 129 of the clean air act.  
(F) A standard or other requirement for consumer and commercial products under  
section 183(e) of the clean air act.  
(G) A standard or other requirement for tank vessels under section 183(f) of the  
clean air act.  
(H) A standard or other requirement of the regulations promulgated to protect  
stratospheric ozone under title VI of the clean air act, unless the administrator of the  
United States environmental protection agency has determined that the standard or  
requirement need not be contained in a renewable operating permit required under title V  
of the clean air act.  
(I) A national ambient air quality standard or increment or visibility requirement  
under the clean air act, title I, part C, but only as it would apply to temporary sources.  
Any applicable requirement which results solely from the requirements of the act, the  
rules promulgated under the act, or the home rule charter for Wayne county, resolution  
no.  
85-305, as amended by resolution no. 89-213, is not enforceable under the clean air act.  
(p) "Applicant" means a person who owns or operates a stationary source and who  
files an application for a permit with the department.  
(q) “Aqueous based parts washer” means a tank containing liquid with a volatile  
organic compound content of less than 5 %, by weight, and at a temperature below its  
boiling point that is used to spray, brush, flush, or immerse metallic and/or plastic objects  
for the purpose of cleaning or degreasing.  
(r) "ASTM" means the American society for testing and materials.  
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(s) "Automobile" means any passenger motor vehicle capable of seating not more  
than 12 occupants.  
History: 1980 AACS; 1981 AACS; 1985 AACS; 1988 AACS; 1989 AACS; 1990 AACS; 1993  
AACS; 1995 AACS; 1998-2000 AACS; 2003 AACS; 2016 AACS.  
R 336.1102 Definitions; B.  
Rule 102. As used in these rules:  
(a) "Best available control technology for toxics" or "T-BACT" means the  
maximum degree of emission reduction which the department determines is reasonably  
achievable for each process that emits toxic air contaminants, taking into account energy,  
environmental, and economic impacts and other costs.  
(b) "Best available information" means the most scientifically credible and relevant  
data available for a particular air contaminant in relation to a risk assessment or the  
development of screening levels. Such information may be taken from the scientific  
literature or the integrated risk information system database maintained by the United  
States environmental protection agency and from other databases, as appropriate. The  
term includes other pertinent studies or reports containing data which the department  
finds to be of adequate quality for use in the risk assessment.  
(c) "Black coating" means a coating that meets both of the following criteria:  
(i) Maximum lightness: 23 units.  
(ii) Saturation: less than 2.8, where saturation equals the square root of A² + B².  
These criteria are based on Cielab color space, 0/45 geometry. For spherical geometry,  
specular included, maximum lightness is 33 units.  
(d) "Blending tank," as it pertains to R 336.1631, means any vessel in which organic  
resin and solvent or other materials are added to produce a product blend.  
(e) "Business machine" means a device that uses electronic or mechanical methods  
to process information, perform calculations, print or copy information or convert sound  
into electrical impulses for transmission, including devices listed in standard industrial  
classification numbers 3572, 3573, 3574, 3579, and 3661, and photocopy machines, a  
subcategory of standard industrial classification number 3861.  
History: 1981 AACS; 1989 AACS; 1992 AACS; 2002 AACS; 2008 AACS; 2016 AACS.  
R 336.1103 Definitions; C.  
Rule 103. As used in these rules:  
(a) "Calendar day" means a 24-hour time period, which normally is midnight to  
midnight, but may, upon written notification to the department, cover a different,  
consecutive 24-hour time period for a specific process.  
(b) "Capacity factor" means the ratio of the average load on a machine or equipment  
for the period of time considered to the capacity rating of the machine or equipment.  
(c) "Carcinogen" means either of the following:  
(i) Belonging to a category of “carcinogenic to humans,” “likely to be carcinogenic  
to humans,” or “suggestive evidence of carcinogenic potential” using the weight of  
evidence narrative approach as described in United States Environmental Protection  
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Agency’s “Guidelines for Carcinogen Risk Assessment” as adopted by reference in R  
336.1902.  
(ii) Any chemical that has been determined to be a carcinogen using another  
generally accepted guideline for carcinogen risk assessment based on sound scientific and  
defensible evidence.  
(d) "Charging period," with respect to coke ovens utilizing larry car charging  
methodology, means the total time taken between the point at which the coal starts  
flowing into the oven and the point at which the leveling door and the charging holes are  
closed with their respective lids after the coal from the larry car hoppers is emptied into  
the oven being charged through the respective charging holes and the coal has been  
leveled in the oven. “Charging period,” with respect to coke ovens utilizing pipeline  
charging methodology, means the total time taken from the time at which the coal starts  
flowing into an oven by opening the preheated coal inlet valve to the time at which the  
coal flow ends when the inlet valve is closed.  
(e) "Class II finishes on hardboard paneling" means a finish that meets the  
specifications of voluntary product standard PS-59-73, as approved by the American  
National Standards Institute.  
(f) "Clean air act" means chapter 360, 69 stat. 322, 42 USC 7401 to 7671q and  
regulations promulgated under the clean air act.  
(g) "Clean charge" means furnace charge materials, including molten metal; t-bar;  
sow; ingot; billet; pig; alloying elements; uncoated or unpainted thermally dried metal  
chips; metal scrap dried at 343 degrees Celsius, 650 degrees Fahrenheit, or higher; metal  
scrap delacquered or decoated at 482 degrees Celsius, 900 degrees Fahrenheit, or higher;  
other oil and lubricant-free unpainted or uncoated gates and risers; oil and lubricant-free  
unpainted or uncoated scrap, shapes, or products, pistons for example, that have not  
undergone any process, for example, machining, coating, painting, that would cause  
contamination of the metal with oils, lubricants, coatings, or paints; and on-site  
runaround.  
(h) "Clear coating" means a coating that lacks color and opacity or is transparent and  
uses the undercoat as a reflectant base or undertone color.  
(i) "Clinical testing of pharmaceuticals" means human or animal health studies that  
are conducted consistent with applicable government regulations, guidelines, or  
directions for approval of a pharmaceutical product, such as those monitored by the  
United States Food and Drug Administration for the purpose of determining any of the  
following with respect to a drug:  
(i) Pharmacological action.  
(ii) Preferred route of administration.  
(iii) Safe dosage range.  
(iv) Optimum dosage schedule.  
(v) Safety and effectiveness.  
(vi) Product label indications.  
(j) "Coating category" means a type of surface coating for which there is a separate  
emission limit specified in these rules.  
(k) "Coating line" means an operation that is a single series in a coating process and  
is comprised of 1 or more coating applicators and any associated flash-off areas, drying  
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areas, and ovens wherein 1 or more surface coatings are applied and subsequently dried  
or cured.  
(l) "Coating of automobiles and light-duty trucks" means the application of prime,  
primer surfacer, topcoat, and final repair to sheet metal and metallic body components  
during assembly of a vehicle. Examples of these sheet metal and metallic body  
components include all of the following:  
(i) Bodies.  
(ii) Fenders.  
(iii) Cargo boxes.  
(iv) Doors.  
(v) Grill openings.  
(m) "Coating of cans" means exterior coating and interior spray coating in 2-piece  
can lines; interior and exterior coating in sheet coating lines for 3-piece cans; side seam  
spray coating and interior spray coating in can fabricating lines for 3-piece cans; and  
sealing compound application and sheet coating in end coating lines.  
(n) "Coating of coils" means the coating of any flat metal sheet or strip that comes in  
rolls or coils.  
(o) "Coating of fabric" means the application of any type of coating to flat sheets of  
a textile substrate, including the application of coatings by saturation or impregnation.  
(p) "Coating of large appliances" means the coating of the component metal parts of  
residential and commercial washers, dryers, ranges, refrigerators, freezers, water heaters,  
dishwashers, trash compactors, air conditioners, and other associated products. Examples  
of these component metal parts include all of the following:  
(i) Doors.  
(ii) Cases.  
(iii) Lids.  
(iv) Panels.  
(v) Interior support parts.  
(q) "Coating of metal furniture" means the coating of any furniture made of metal  
and includes the coating of any metal part that is or must be assembled with other metal,  
wood, fabric, plastic, or glass parts to form a furniture piece.  
(r) "Coating of paper" means the application of any decorative, functional, or  
saturation coating applied across the entire width of any flat sheet or pressure-sensitive  
tape, regardless of substrate, or applied across a partial width of any flat sheet or  
pressure-sensitive tape, regardless of substrate, if this partial coverage is not considered  
to be an operation or series of operations that is included in the definition of graphic arts  
line in R 336.1107(e). These applications and substrates include paper, fabric, or plastic  
film; related wet-coating processes on plastic film, including typewriter ribbons,  
photographic film, and magnetic tape; and decorative coatings on metal foil, including  
gift wrapping and packaging; paperboard; and pressure sensitive tapes or labels. Coating  
of paper does not include coatings used in substrate formation within a papermaking  
system or coatings applied within all printing lines including, but not limited to, those  
that comply with requirements contained in R 336.1624, R 336.1624a, and R 336.1635.  
(s) "Coating of plastic parts of automobiles and trucks" means the coating of any  
plastic part that is or can be assembled with other parts to form an automobile or truck.  
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(t) "Coating of plastic parts of business machines" means the coating of any plastic  
part that is or can be assembled with other parts to form a business machine.  
(u) "Coating of vinyl" means any printing, decorative coating, or protective topcoat  
applied over vinyl-coated fabric or vinyl rolls or sheets. Coating of vinyl does not  
include the application of plastisols.  
(v) "Coke battery" means a series of coke ovens arranged side by side with an  
integral heating system.  
(w) "Coke oven" means a chamber in which coal is destructively distilled to yield  
coke.  
(x) "Cokeside," with respect to a coke oven, means that side of the coke oven  
through which coke is discharged.  
(y) "Coking cycle" means the time during which coal undergoes destructive  
distillation in a coke oven. The coking cycle commences at the end of the charging  
period and ends at the beginning of the pushing operation, but does not include any  
decarbonization periods.  
(z) "Cold cleaner" means a tank containing organic solvent with a volatile organic  
compound content of 5 % or more, by weight, and at a temperature below its boiling  
point that is used to spray, brush, flush, or immerse metallic or plastic, or both metallic  
and plastic objects, for the purpose of cleaning or degreasing.  
(aa) "Commercial location" means a publicly or privately owned place where  
persons are engaged in the exchange or sale of goods or services and multiple housing  
units designed for 3 or more families, except for elementary and secondary schools and  
facilities owned and operated by this state. A separate building or group of buildings used  
for the exchange or sale of goods or services and having a single owner and manager  
constitutes a separate commercial location.  
(bb) "Completed organic resin" means organic resin solids, solvents, and additives  
as deliverable for sale or use, including a dry organic resin.  
(cc) "Compliance plan" means a description of the compliance status of a source  
with respect to all applicable requirements for each process or process equipment as  
follows:  
(i) For applicable requirements with which the source is in compliance, a statement  
that the source will continue to comply with the requirements.  
(ii) For applicable requirements that will become effective during the permit term, a  
statement that the source will meet the requirements on a timely basis.  
(iii) For applicable requirements for which the stationary source is not in  
compliance at the time of permit issuance, a narrative description of how the stationary  
source will achieve compliance with the requirements.  
(dd) "Component" means 1 of the following, but does not include a valve that is not  
externally regulated, that is, a valve that has no external controls and thus does not have  
the potential to leak a volatile organic compound:  
(i) As it pertains to the provisions of R 336.1622, component means any piece of  
equipment that has the potential to leak a volatile organic compound and includes all of  
the following:  
(A) Pump seals.  
(B) Compressor seals.  
(C) Seal oil degassing vents.  
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(D) Pipeline valves.  
(E) Flanges and other connections.  
(F) Pressure-relief devices.  
(G) Process drains.  
(H) Open ended pipes.  
(ii) As it pertains to the provisions of R 336.1628, component means all of the  
following:  
(A) Compressor seals.  
(B) Process valves in light liquid or gaseous volatile organic compound service.  
(C) Pressure-relief valves in gaseous volatile organic compound service.  
(D) Seals of pumps in light liquid service.  
(iii) As it pertains to the provisions of R 336.1629, component means all of the  
following:  
(A) Compressor seals.  
(B) Process valves.  
(C) Pressure-relief valves.  
(D) Pump seals.  
(ee) "Component in field gas service" means a component that processes, transfers,  
or contains field gas.  
(ff) "Component in gaseous volatile organic compound service" means a component  
that processes, transfers, or contains a volatile organic compound in the gaseous phase  
under actual conditions.  
(gg) "Component in heavy liquid service" means a component that processes,  
transfers, or contains heavy liquid.  
(hh) "Component in light liquid volatile organic compound service" means a  
component that contacts a light liquid containing more than 10% volatile organic  
compound by weight.  
(ii) "Component in liquid volatile organic compound service" means a component  
that processes, transfers, or contains a volatile organic compound in the liquid phase  
under actual conditions.  
(jj) "Condenser" means a device that effects the removal of an air contaminant from  
an exhaust stream by a physical change of state from a vapor to a liquid or solid form.  
(kk) "Control equipment" means air pollution control equipment.  
(ll) "Conventional air-atomizing spray equipment" means a device that is designed  
to atomize and direct fluid material solely through the use of compressed air and is  
capable of operating at air pressures of more than 10 pounds per square inch.  
(mm) "Conveyorized cold cleaner" means any continuous system that transports  
metallic or plastic, or both metallic and plastic objects through a bath containing organic  
solvent at a temperature below its boiling point for the purpose of cleaning or degreasing.  
(nn) "Conveyorized vapor degreaser" means any continuous system that transports  
metallic objects through or over, or through and over, a bath containing organic solvent  
that is heated to its boiling point for the purpose of cleaning or degreasing.  
(oo) "Cycle of operation," with respect to continuous emission monitoring systems,  
means the total time a monitoring system requires to sample, analyze, and record an  
emission measurement.  
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History: 1980 AACS; 1981 AACS; 1985 AACS; 1989 AACS; 1990 AACS; 1992 AACS; 1993  
AACS; 1995 AACS; 2003 AACS; 2008 AACS; 2016 AACS; 2025 MR 8, Eff. April 28, 2025.  
R 336.1104 Definitions; D.  
Rule 104. As used in these rules:  
(a) "Decarbonization period," with respect to coke ovens, means the time for  
combusting carbon formed at the oven roof and in the standpipe assembly. The  
decarbonization period commences when a charging hole lid or lids or a standpipe lid or  
lids are removed or opened near the end of the coking cycle and ends with the initiation  
of the next charging period.  
(b) "Delivery vessel" means any tank truck, tank-equipped trailer, railroad tank car,  
or any similar vessel equipped with a storage tank used for the transport of a volatile  
organic compound from sources of supply to any stationary vessel.  
(c) "Demolition waste material" means waste building materials that result from  
demolition operations on houses and commercial and industrial buildings.  
(d) "Department" means the director of the department of environment, Great Lakes,  
and energy or the director’s designee.  
(e) "Difficult-to-monitor component" means a component that can only be  
monitored by elevating the monitoring personnel more than 6 feet above a support  
surface.  
(f) "Dispensing facility" means a location where gasoline is transferred to a motor  
vehicle tank from a stationary vessel.  
(g) "Dry organic resin" means the organic resin solids from which all liquids have  
been removed, as deliverable for sale or use.  
History: 1980 AACS; 1989 AACS; 1993 AACS; 1998-2000 AACS; 2002 AACS; 2008 AACS; 2025  
MR 8, Eff. April 28, 2025.  
R 336.1105 Definitions; E.  
Rule 105. As used in these rules:  
(a) "Electrostatic prep coat" means a coating that is applied to a plastic part solely to  
provide conductivity for the subsequent application of a prime, a topcoat, or other coating  
through the use of electrostatic application methods. An electrostatic prep coat is clearly  
identified as an electrostatic prep coat on its accompanying material safety data sheet.  
(b) "Emission unit" means any part of a stationary source that emits or has the  
potential to emit an air contaminant. Examples of emission units include the following:  
(i) A fossil fuel-fired, steam-generating unit.  
(ii) A topcoat painting line.  
(iii) A solid waste incinerator.  
(iv) A clinker cooler at a Portland cement plant.  
(v) A process unit at a chemical plant.  
(c) "Equipment utilized in the manufacturing of synthesized pharmaceutical  
products" means equipment associated with the storage, transfer, or manufacturing of  
pharmaceutical products, including raw materials and intermediate products, by chemical  
synthesis. This definition does not include equipment associated with the manufacturing  
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of pharmaceutical products by fermentation or extraction, the formulation or packaging  
of bulk pharmaceuticals, or the processing of waste resulting from pharmaceutical  
synthesis.  
(d) "Equivalent method," with respect to source sampling, means a method or set of  
procedures for obtaining source samples that has been demonstrated to the department's  
satisfaction to have a consistent and quantitatively known relationship to an applicable  
reference test method.  
(e) "Excess air" means any air in excess of the amount of air required for complete  
combustion of a material as determined by using reference test method 3 of appendix A  
to the department's rules.  
(f) "Excess emissions" means emissions of an air contaminant in excess of any  
applicable emission limitation.  
(g) "External floating roof stationary vessel" means an open top stationary vessel  
equipped with a cover or roof which rests upon and is supported by the liquid being  
contained and which has a closure seal or seals to reduce the space between the cover or  
roof edge and the vessel wall.  
(h) "Extreme environmental conditions" means any of the following:  
(i) Outdoor weather.  
(ii) Temperatures consistently above 95 degrees Celsius (203 degrees Fahrenheit).  
(iii) Detergents.  
(iv) Abrasive and scouring agents.  
(v) Solvents.  
(vi) Corrosive atmospheres.  
(vii) Other similar harsh conditions.  
(i) "Extreme performance coating" means a coating which is designed to protect a  
coated part from extreme environmental conditions and which is applied to a part that, in  
its use as a finished product, is intended to be subjected to extreme environmental  
conditions.  
History: 1980 AACS; 1981 AACS; 1989 AACS; 1993 AACS; 1994 AACS; 2002 AACS; 2008  
AACS.  
R 336.1106 Definitions; F.  
Rule 106. As used in these rules:  
(a) "Federally enforceable" means that a limitation or condition is enforceable by the  
United States environmental protection agency. Limitations and conditions which are  
enforceable by the United States environmental protection agency include requirements  
developed pursuant to 40 C.F.R. parts 60, 61, and 63; requirements within the state  
implementation plan; any renewable operating permit requirement designated as federally  
enforceable pursuant to R 336.1213(1)(a); and any permit requirement established  
pursuant to R 336.1201(1)(a), part 18, or part 19 of these rules.  
(b) "Field gas" means a feedstock gas entering a natural gas processing plant.  
(c) "Field testing" means the limited use or distribution of a product to determine the  
quality of the product, including its suitability for its intended end use.  
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(d) "Fixed roof stationary vessel" means a stationary vessel with a roof connected in  
a rigid fashion to the side walls of the vessel, a spherically-shaped vessel, or a pressure  
vessel designed to maintain a specific working pressure.  
(e) "Flexible coating" means any coating that is required to comply with engineering  
specifications for impact resistance, mandrel bend, or elongation as defined by the  
original equipment manufacturer.  
(f) "Flexographic printing" means the application of words, designs, or pictures to a  
substrate by means of a roll printing technique in which the pattern to be applied is raised  
above the printing roll and the image carrier is made of rubber or other elastomeric  
materials.  
(g) "Fog coat" means a coating that is applied to a plastic part for the purpose of  
color matching without masking a molded-in texture. A fog coat shall not be applied at a  
thickness of more than 0.5 mils of coating solids.  
(h) "Fossil fuel-fired steam generator" means a furnace or boiler used in the process  
of burning fossil fuel for the primary purpose of producing steam by heat transfer.  
(i) "Fuel-burning equipment" means a device, contrivance, or equipment used  
principally, but not exclusively, for the burning of fuel, and all appurtenances thereto,  
including ducts, breechings, control equipment, fuel-feeding equipment, ash removal  
equipment, combustion controls, and stacks and chimneys, which equipment is used for  
indirect heating in which the material being heated is not contacted by, and does not add  
substance to, the products of combustion. This equipment typically includes that used for  
all of the following:  
(i) Heating water to boiling.  
(ii) Raising steam or superheating steam.  
(iii) Heating air as in a warm-air furnace.  
(iv) Furnishing process heat that is conducted through vessel walls.  
(v) Furnishing process heat indirectly through its transfer by fluids.  
(j) "Fuel gas system" means any system in which gas generated by a petroleum  
refinery process unit is combusted, including any gaseous mixture of natural gas with  
such gas, and is not commercially sold.  
(k) "Fugitive dust" means particulate matter that is generated from indoor processes,  
activities, or operations and that is emitted into the outer air through building openings  
and general exhaust ventilation, except stacks. The term also means particulate matter  
that is emitted into the outer air from outdoor processes, activities, or operations due to  
the forces of the wind or human activity.  
(l) "Fugitive emissions" means those emissions which could not reasonably pass  
through a stack, chimney, vent, or other functionally equivalent opening.  
History: 1980 AACS; 1981 AACS; 1985 AACS; 1989 AACS; 1992 AACS; 2003 AACS; 2016  
AACS.  
R 336.1107 Definitions; G.  
Rule 107. As used in these rules:  
(a) "Gasoline" means any petroleum distillate which has a Reid vapor pressure equal  
to or greater than 4.0 psia and which is used for automotive fuel.  
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(b) "Geographical site" means contiguous land ownership by 1 landowner. A public  
right of way, such as a road, railroad, and watercourse, through part of the site, is not  
considered to break the continuity. Where transmission and fuel delivery rights-of-way  
or a strip of land that serves no other purpose than as a transportation or materials  
handling link connects 2 or more otherwise separate geographical sites, the connected  
sites shall be considered separate geographical sites.  
(c) "Good engineering practice design" means, with respect to stack heights, the  
height necessary to ensure that emissions from the stack result in acceptable  
concentrations of air contaminants in the immediate vicinity of the stationary source as a  
result of atmospheric downwash, eddies, and wakes which may be created by the  
stationary source itself, nearby structures, or nearby terrain obstacles and will not exceed  
the greatest of the following limits:  
(i) Two hundred and thirteen feet (65 meters).  
(ii) Two and one-half times the height of the structure or nearby structure for those  
stacks for which construction or modification commenced on or before January 12, 1979,  
if the owner or operator produces evidence that this relationship was actually relied upon  
in designing the stack to ensure protection against downwash.  
(iii) The sum of the height of the structure or nearby structure plus 1.5 times the  
lesser of the height or width of the structure or nearby structure for those stacks for which  
construction or modification commenced after January 12, 1979.  
(iv) Such height as an owner or operator of a stationary source demonstrates, to the  
satisfaction of the department, is necessary through the use of field studies or fluid  
models after notice and opportunity for public hearing.  
(d) "Gloss reducer" means a coating that is applied to a plastic part solely to reduce  
the shine of the part. A gloss reducer shall not be applied at a thickness of more than 0.5  
mils of coating solids.  
(e) "Graphic arts line" means an operation or series of operations in which printing  
(the formation of words), designs, or pictures on a substrate by means of partial coverage  
of the substrate are employed. A graphic arts line may also employ 1 or more coating  
operations in which a uniform layer of coating is applied either across the entire width of  
the substrate or across only certain portions of the substrate.  
History: 1980 AACS; 1981 AACS; 1989 AACS; 2002 AACS; 2016 AACS.  
R 336.1108 Definitions; H.  
Rule 108. As used in these rules:  
(a) "Hardboard" means a panel manufactured primarily from interfelted ligno-  
cellulosic fibers which are consolidated under heat and pressure in a hot press.  
(b) "Hardwood plywood" means plywood whose surface layer is a veneer of  
hardwood.  
(c) "Heavy liquid" means a liquid that is less than 10% evaporated at 150 degrees  
Centigrade as determined by ASTM method D86, adopted by reference in R 336.1902.  
(d) "High bake coating" means a coating that is designed to cure only at  
temperatures of more than 90 degrees Celsius (194 degrees Fahrenheit).  
(e) "High-speed dispersion mill" means a mixer that has 1 or more blades which  
rotate at high speed to disperse coating solids.  
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History: 1981 AACS; 1989 AACS; 2002 AACS; 2016 AACS.  
R 336.1109 Definitions; I.  
Rule 109. As used in these rules:  
(a) "Incinerator" means a device specifically designed for the destruction, by  
burning, of garbage or other combustible refuse or waste material, or both, in which the  
products of combustion are emitted into the outer air by passing through a stack or  
chimney.  
(b) "Inhalation reference concentration" or "RfC" means a conservative estimate of  
the daily exposure to the human population, including sensitive subgroups, that is likely  
to be without appreciable risk of deleterious noncancerous effect during a lifetime. The  
inhalation reference concentration is for continuous inhalation exposures and is expressed  
in units of milligrams per cubic meter (mg/m³).  
(c) "Initial risk screening level" or “IRSL” means the concentration of a possible,  
probable, or known human carcinogen in ambient air which has been calculated for  
regulatory purposes, according to the risk assessment procedures in R 336.1229(1), to  
produce an estimated upper-bound lifetime cancer risk of 1 in 1,000,000.  
(d) "Initial threshold screening level" or “ITSL” means a concentration of toxic air  
contaminant in the ambient air that is used to evaluate noncarcinogenic health effects  
from a proposed new or modified process and that is calculated, for regulatory purposes,  
according to the procedures in R 336.1229(2).  
(e) "Insulation of magnet wire" means the process of coating aluminum or copper  
electrical wire by application of a nonconductive material, such as varnish or enamel.  
History: 1980 AACS; 1981 AACS; 1992 AACS; 2008 AACS; 2016 AACS.  
R 336.1112 Definitions; L.  
Rule 112. As used in these rules:  
(a) "Light-duty truck" means any motor vehicle that is rated at not more than 8,500  
pounds gross vehicle weight and that is designed primarily for the transportation of  
property, including pickups, vans, and window vans.  
(b) "Light liquid," as it pertains to R 336.1628, means a liquid that contains 1 or  
more volatile organic compounds which have vapor pressures of more than 0.04 psia at  
20 degrees Centigrade if the total concentration of the pure volatile organic compounds  
which have vapor pressures of more than 0.04 psia at 20 degrees Centigrade is equal to or  
greater than 20%, by weight, of the liquid and if the fluid is a liquid at operating  
conditions.  
(c) "Limited evidence," a term of art, means either of the following:  
(i) In human epidemiological studies, the data indicate that a causal relationship  
between the agent and human cancer is credible, but that alternative explanations, such as  
chance, bias, or confounding variables, could not be adequately excluded.  
(ii) In animal studies, data suggest a carcinogenic effect, but are limited because of  
any of the following:  
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(A) The studies involve a single species, strain, or experiment and do not meet  
criteria for sufficient evidence.  
(B) The experiments are restricted by any of the following:  
(1) Inadequate dosage levels.  
(2) Inadequate duration or exposure to the agent.  
(3) Inadequate period of follow-up.  
(4) Poor survival.  
(5) Too few animals.  
(6) Inadequate reporting.  
(C) The data show an increase in the incidence of benign tumors only.  
(d) "Loading facility" means a location where volatile organic compounds are  
received from sources of supply and are stored for later delivery to another facility.  
History: 1980 AACS; 1989 AACS; 1990 AACS; 1992 AACS; 2008 AACS; 2016 AACS.  
R 336.1113 Definitions; M.  
Rule 113. As used in these rules:  
(a) "Malfunction" means any sudden, infrequent and not reasonably preventable  
failure of a source, process, process equipment, or air pollution control equipment to  
operate in a normal or usual manner. Failures that are caused in part by poor  
maintenance or careless operation are not malfunctions.  
(b) "Market testing or market development" means the limited or general  
distribution of a product to the consumer to gather information concerning the demand  
for the product.  
(c) "Material handling equipment," as referenced in table 31 of R 336.1331, means a  
device, contrivance, or equipment used to bag, blend, convey, crush, grind, load, mill,  
mix, shed, store, transfer, or unload a physical substance.  
(d) "Material recovery equipment" means any equipment utilized in the transport  
and recovery of styrene monomer and other impurities from other products and by-  
products in the manufacture of polystyrene resin by continuous process, including the  
styrene devolatilizer unit and styrene recovery unit.  
(e) “Minus water” means subtraction of water and compounds that are used as  
organic solvents and excluded from the definition of volatile organic compound.  
(f) "Modify" means making a physical change in, or change in the method of  
operation of, existing process or process equipment that increases the amount of any air  
contaminant emitted into the outer air that is not already allowed to be emitted under the  
conditions of a permit or order or results in the emission of any toxic air contaminant into  
the outer air not previously emitted. An increase in the hours of operation or an increase  
in the production rate up to the maximum capacity of the process or process equipment is  
not considered to be a change in the method of operation unless the process or process  
equipment is subject to enforceable permit conditions or enforceable orders that limit the  
production rate or the hours of operation, or both, to a level below the proposed increase.  
(g) "Motor vehicle" means any self-propelled vehicle registered for, or requiring  
registration for, use on the highway.  
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(h) “Motor vehicle material” means coatings applied to motor vehicles or motor  
vehicle components at facilities that are not automobile or light-duty truck assembly  
coating facilities.  
History: 1980 AACS; 1989 AACS; 1990 AACS; 1992 AACS; 1993 AACS; 1995 AACS; 2002  
AACS; 2008 AACS; 2016 AACS; 2025 MR 8, Eff. April 28, 2025.  
R 336.1114 Definitions; N.  
Rule 114. As used in these rules:  
(a) "Natural finish hardwood plywood panel" means a panel that has its original  
grain pattern enhanced by essentially transparent finishes frequently supplemented by  
fillers and toners.  
(b) "Natural gas processing plant" means a stationary source where the extraction of  
natural gas liquids from field gas or the fractionation of the liquids into natural gas  
products, such as ethane, propane, butane, and natural gasoline, takes place.  
(c) "Natural gas process unit" means process equipment assembled for the extraction  
of natural gas liquids from field gas, the fractionation of the liquids into natural gas  
products, or other operations associated with the processing of natural gas products. A  
natural gas process unit may operate independently if supplied with sufficient feed or raw  
materials and sufficient storage facilities for the products.  
(d) "Nearby" means, with respect to good engineering practice design stack heights,  
a distance of up to 5 times the lesser of the height or the width dimension of a structure,  
but not more than 0.8 kilometers (0.5 miles). The height of the structure is measured  
from the ground level elevation at the base of the stack.  
(e) "Nonattainment area" means an area designated as not having attained full  
compliance with any national ambient air quality standard pursuant to section 107(d) of  
the clean air act. Such designation shall be air contaminant specific and shall not mean  
that an area is a nonattainment area for any other air contaminant unless so specified.  
The department shall maintain a list of designated nonattainment areas and shall update  
the list when air quality monitoring or modeling data warrant. For certain air  
contaminants, nonattainment areas are classified for the purposes of applying an  
attainment date, or for other purposes, in accordance with procedures established  
pursuant to the clean air act. For ozone nonattainment areas, classifications are  
established as follows:  
(i) Nonclassifiable.  
(ii) Marginal.  
(iii) Moderate.  
(iv) Serious.  
(v) Severe.  
(vi) Extreme.  
History: 1980 AACS; 1981 AACS; 1989 AACS; 1990 AACS; 1993 AACS; 2003 AACS; 2008  
AACS; 2016 AACS.  
R 336.1115 Definitions; O.  
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Rule 115. As used in these rules:  
(a) "Opacity" means the degree to which an emission reduces the transmission of  
light or obscures an observer's view.  
(b) "Open burning" means a fire from which the products of combustion are emitted  
directly into the outer air without passing through a stack or chimney.  
(c) "Open top vapor degreaser" means a tank that contains organic solvent that is  
heated to its boiling point for the purpose of cleaning or degreasing metallic objects  
through the condensation of the hot solvent vapor on the colder object.  
(d) "Oral reference dose" or "RfD" means a conservative estimate of the daily  
exposure to the human population, including sensitive subgroups, that is likely to be  
without appreciable risk of deleterious noncancerous effect during a lifetime. The  
reference dose is expressed in units of milligrams per kilogram of body weight per day.  
(e) "Organic compound" means any compound of carbon or mixture of such  
compounds, excluding all of the following:  
(i) Carbon monoxide.  
(ii) Carbon dioxide.  
(iii) Carbonic acid.  
(iv) Metallic carbides or carbonates.  
(v) Boron carbide.  
(vi) Silicon carbide.  
(vii) Ammonium carbonate.  
(viii) Ammonium bicarbonate.  
(ix) Methane.  
(x) Ethane.  
(f) "Organic compound-water separator" means any vessel, device, or piece of  
equipment that is operated for the recovery of organic compounds from waste water and  
which, in any 1 day, recovers more than 200 gallons of organic compounds from any  
equipment that processes, refines, stores, or handles such compounds with a Reid vapor  
pressure of more than 0.5 psia.  
(g) "Organic resin" means a solid or semisolid, water insoluble, organic material as  
listed in standard industrial classification code 2821. The resin has little or no tendency  
to crystallize and is used as the basic component of plastics or as a component of surface  
coating formulations.  
(h) "Organic solvent" means any volatile organic compound that is used as a diluent,  
thinner, dissolver, viscosity reducer, or cleaning agent or for other similar uses.  
(i) "Outer air" means air in all space outside of buildings, stacks, or exterior ducts.  
History: 1980; 1981 AACS; 1989 AACS; 1990 AACS; 1992 AACS; 2016 AACS.  
R 336.1116 Definitions; P.  
Rule 116. As used in these rules:  
(a) "Packaging rotogravure printing" means rotogravure printing on a substrate that,  
in subsequent operations, is formed into a packaging product or label, or both.  
(b) "Paint manufacturing" means the grinding or mixing of a combination of  
pigments, resins, and liquids to produce a surface coating as listed in standard industrial  
classification code 2851.  
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(c) "Particulate matter" means any air contaminant existing as a finely divided liquid  
or solid, other than uncombined water, as measured by a reference test specified in R  
336.2004(5) or by an equivalent or alternative method.  
(d) "Perchloroethylene dry cleaning equipment" means equipment utilized in the  
cleaning of fabrics for which perchloroethylene (tetrachloroethylene) is the predominant  
cleaning medium.  
(e) "Performance test" means the taking of a source sample at a stationary source by  
employing department-approved methods to determine either of the following:  
(i) Compliance with the department's rules, orders, or emission limitations.  
(ii) Compliance with the conditions of a permit to install or renewable operating  
permit.  
(f) "Permit to install" means a permit issued by the department authorizing the  
construction, installation, relocation, or alteration of any process, fuel-burning, refuse-  
burning, or control equipment in accordance with approved plans and specifications.  
(g) "Permit to operate" means a permit issued by the department authorizing the use  
of any process, fuel-burning, refuse-burning, or control equipment for the period  
indicated after it has been demonstrated that it can be operated in compliance with these  
rules. The requirement to obtain a permit to operate was removed from these rules  
effective July 26, 1995. Permits to operate issued before that date remain effective and  
legally enforceable unless they are voided pursuant to R 336.1201(6).  
(h) "Person" means any of the following:  
(i) An individual person.  
(ii) Trustee.  
(iii) Court-appointed representative.  
(iv) Syndicate.  
(v) Association.  
(vi) Partnership.  
(vii) Firm.  
(viii) Club.  
(ix) Company.  
(x) Corporation.  
(xi) Business trust.  
(xii) Institution.  
(xiii) Agency.  
(xiv) Government corporation.  
(xv) Municipal corporation.  
(xvi) City.  
(xvii) County.  
(xviii) Municipality.  
(xix) District.  
(xx) Other political subdivision, department, bureau, agency, or instrumentality of  
federal, state, or local government.  
(xxi) Other entity recognized by law as the subject of rights and duties.  
(i) "Petroleum" means the crude oil removed from the earth and the oils derived  
from tar sands, shale, and coal gasification or liquefaction.  
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(j) "Petroleum refinery" means any facility engaged in producing gasoline, kerosene,  
distillate fuel oils, residual fuel oils, lubricants, or other products through distillation of  
petroleum or through redistillation, cracking, or the reforming of unfinished petroleum  
derivatives.  
(k) "PM-10" means particulate matter that has an aerodynamic diameter less than or  
equal to a nominal 10 micrometers, as measured by a reference test specified in 40 CFR  
part 51, appendix M, adopted by reference in R 336.1902. PM-10 emissions must include  
gaseous emissions from a source or activity that condense to form particulate matter at  
ambient temperatures. The condensable particulate matter must be accounted for in  
applicability determinations and in establishing emissions limitations for PM-10.  
(l) “PM 2.5” means particulate matter that has an aerodynamic diameter less than or  
equal to a nominal 2.5 micrometers, as measured by a reference test specified in 40 CFR  
part 51, appendix M, adopted by reference in R 336.1902. PM 2.5 emissions must include  
gaseous emissions from a source or activity that condense to form particulate matter at  
ambient temperatures. The condensable particulate matter must be accounted for in  
applicability determinations and in establishing emissions limitations for PM 2.5.  
(m) "Potential emissions" means those emissions expected to occur without control  
equipment, unless this control equipment is, aside from air pollution control  
requirements, vital to production of the normal product of the source or to its normal  
operation. Annual potential emissions must be based on the maximum annual-rated  
capacity of the source, unless the source is subject to enforceable permit conditions or  
enforceable orders that limit the operating rate or the hours of operation, or both.  
Enforceable agreements or permit conditions on the type or amount of materials  
combusted or processed must be used in determining the potential emission rate of a  
source.  
(n) "Potential to emit" means the maximum capacity of a stationary source to emit  
an air contaminant under its physical and operational design. Any physical or operational  
limit on the capacity of the stationary source to emit an air contaminant, including air  
pollution control equipment and restrictions on the hours of operation or the type or  
amount of material combusted, stored, or processed, must be treated as part of its design  
only if the limit, or the effect it would have on emissions, is legally enforceable.  
Secondary emissions do not count in determining the potential to emit of a stationary  
source. For hazardous air pollutants that have been listed pursuant to section 112(b) of  
the clean air act, 42 USC 7412, quantifiable fugitive emissions must be included in  
determining the potential to emit of any stationary source. For all other air contaminants,  
quantifiable fugitive emissions must be included in determining the potential to emit of a  
stationary source only if the stationary source belongs to 1 of the following categories:  
(i) Coal cleaning plants that have thermal dryers.  
(ii) Kraft pulp mills.  
(iii) Portland cement plants.  
(iv) Primary zinc smelters.  
(v) Iron and steel mills.  
(vi) Primary aluminum ore reduction plants.  
(vii) Primary copper smelters.  
(viii) Municipal incinerators capable of charging more than 50 tons of refuse per  
day.  
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(ix) Hydrofluoric, sulfuric, or nitric acid plants.  
(x) Petroleum refineries.  
(xi) Lime plants.  
(xii) Phosphate rock processing plants.  
(xiii) Coke oven batteries.  
(xiv) Sulfur recovery plants.  
(xv) Carbon black plants that have a furnace process.  
(xvi) Primary lead smelters.  
(xvii) Fuel conversion plants.  
(xviii) Sintering plants.  
(xix) Secondary metal production plants.  
(xx) Chemical process plants. The term chemical process plant does not include  
ethanol production facilities that produce ethanol by natural fermentation included in  
North American industrial classification system codes 325193 or 312140.  
(xxi) Fossil fuel boilers, or combination thereof, totaling more than 250,000,000  
Btu per hour heat input.  
(xxii) Petroleum storage and transfer units that have a total storage capacity of more  
than 300,000 barrels or petroleum storage vessels that have a capacity of more than  
40,000 gallons.  
(xxiii) Taconite ore processing plants.  
(xxiv) Glass-fiber processing plants.  
(xxv) Charcoal production plants.  
(xxvi) Fossil fuel-fired steam electric plants of more than 250,000,000 Btu per hour  
heat input.  
(xxvii) Asphalt concrete plants.  
(xxviii) Secondary lead smelters and refineries.  
(xxix) Sewage treatment plants.  
(xxx) Phosphate fertilizer plants.  
(xxxi) Ferroalloy production plants.  
(xxxii) Grain elevators.  
(xxxiii) Stationary gas turbines.  
(xxxiv) Stationary sources that are subject to the Federal National Emission  
Standards for Hazardous Air Pollutants for the following materials:  
(A) Asbestos.  
(B) Beryllium.  
(C) Mercury.  
(D) Vinyl chloride.  
(o) "PPM" means parts per million, by volume.  
(p) "Printed interior panel" means a panel that has its grain or natural surface  
obscured by fillers and basecoats and on which a simulated grain or decorative pattern is  
printed.  
(q) "Process" means an action, operation, or a series of actions or operations at a  
source that emits or has the potential to emit an air contaminant. Examples of a process  
include any of the following:  
(i) A physical change of a material.  
(ii) A chemical change of a material.  
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(iii) The combustion of fuel, refuse, or waste material.  
(iv) The storage of a material.  
(v) The handling of a material.  
(r) "Process equipment" means all equipment, devices, and auxiliary components,  
including air pollution control equipment, stacks, and other emission points, used in a  
process.  
(s) "Process unit turnaround" means the scheduled shutdown of a refinery process  
unit for the purpose of inspection or maintenance of the unit.  
(t) "Production equipment exhaust system" means a device for collecting and  
removing, from the immediate area, fugitive air contaminants from any process  
equipment.  
(u) "Psia" means pounds per square inch absolute.  
(v) "Publication rotogravure printing" means rotogravure printing on a substrate that  
is subsequently formed into any of the following:  
(i) Book.  
(ii) Magazine.  
(iii) Catalogue.  
(iv) Brochure.  
(v) Directory.  
(vi) Newspaper.  
(vii) Supplement.  
(viii) Other type of printed material.  
(w) "Pushing operation," with respect to coke ovens, means the movement of the  
coke from a coke oven into the coke-receiving car.  
(x) "Pushside," with respect to a coke oven, means that side of the coke oven that is  
adjacent to the pushing machine.  
History: 1980 AACS; 1981 AACS; 1985 AACS; 1989 AACS; 1990 AACS; 1992 AACS; 1993  
AACS; 1995 AACS; 1996 AACS; 2003 AACS; 2012 AACS; 2016 AACS; 2025 MR 8, Eff. April 28,  
2025.  
R 336.1118 Definitions; R.  
Rule 118. As used in these rules:  
(a) "Reactor" means a vessel which may be jacketed to permit temperature control  
and which is designed to contain materials during chemical reaction.  
(b) "Reconstruction" means the replacement of components of an existing facility so  
that the fixed capital cost of the new components is more than 50% of the fixed capital  
cost that would be required to construct a comparable entirely new emission unit and so  
that it is technologically and economically feasible to meet the applicable requirement.  
"Fixed capital cost," as used in this subdivision, means the capital needed to provide all  
of the depreciable components.  
(c) "Red coating" means a coating that meets all of the following criteria:  
(i) Yellow limit: the hue of hostaperm scarlet.  
(ii) Blue limit: the hue of monastral red-violet.  
(iii) Lightness limit for metallics: 35% aluminum flake.  
(iv) Lightness limit for solids: 50% titanium dioxide white.  
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(v) Solid reds: hue angle of -11 to 38 degrees and maximum lightness of 23 to 45  
units.  
(vi) Metallic reds: hue angle of -16 to 35 degrees and maximum lightness of 28 to  
45 units. These criteria are based on Cielab color space, 0/45 geometry. For spherical  
geometry, specular included, the upper limit is 49 units. The maximum lightness varies  
as the hue moves from violet to orange. This is a natural consequence of the strength of  
the colorants, and real colors show this effect.  
(d) "Reference test method," with respect to source sampling, means a method or  
set of procedures, as described in appendix A to these rules, for obtaining source samples.  
(e) "Refinery unit" means a set of components and other equipment that are a part of  
a basic process operation, such as distillation, hydrotreating, cracking, or reforming of  
hydrocarbons.  
(f) "Reid vapor pressure" means the absolute vapor pressure of an organic  
compound at 100 degrees Fahrenheit as measured by the standard test method set forth  
in ASTM D323, adopted by reference in R 336.1902, or approved equivalent.  
(g) "Repetitive production of a product" means production, for purposes other than  
clinical testing of pharmaceuticals, that meets the following criteria:  
(i) Batch processes or process equipment producing 10 or more batches of product.  
(ii) Continuous processes or process equipment running for a period of more than 10  
times the length of time for the raw materials to become finished product or 24 hours,  
whichever is longer.  
(h) "Research and development activities" means activities conducted for the  
primary purpose of developing new production processes and products, testing more  
efficient production processes, or testing methods for preventing or reducing adverse  
environmental impacts, if the activities are in compliance with both of the following  
provisions:  
(i) The activities do not include the production of an intermediate or final product  
for sale or exchange for commercial profit, except in a de minimis manner.  
(ii) The activities are conducted at a research or laboratory facility that is operated  
under the close supervision of technically trained personnel.  
(i) "Resist coat" means a coating that is applied to a plastic part before metallic  
plating to prevent deposits of metal on portions of the plastic part.  
(j) "Responsible official" means, for the purposes of signing and certifying the truth,  
accuracy, and completeness of permit applications, monitoring and other reports, and  
compliance certifications, any of the following:  
(i) For a corporation, a president, secretary, treasurer, or vice-president of the  
corporation who is in charge of a principal business function or any other person who  
performs similar policy or decision-making functions for the corporation. The person  
identified in this paragraph may appoint another person as his or her authorized  
representative under either of the following circumstances:  
(A) The representative is responsible for the overall operation of 1 or more  
manufacturing, production, or operating facilities applying for or subject to a permit and  
either the facilities employ more than 250 persons or have gross annual sales or  
expenditures of more than $25,000,000.00.  
(B) The representative has responsibilities for the overall operation of a source and  
is approved in advance by the department. A responsible official shall submit a written  
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request for approval from the department to designate an authorized representative  
pursuant to this paragraph. The department shall respond, in writing, within 30 days of  
receipt of the request.  
(ii) For a partnership or sole proprietorship, a general partner or the proprietor.  
(iii) For a county, city, village, township, state, federal, or other public agency,  
either a principal executive officer or ranking elected official. For this purpose, a  
principal executive officer includes the chief executive officer who has responsibility for  
the overall operations of a principal geographic unit of the agency.  
(iv) For affected sources under title IV of the clean air act, the designated  
representative as defined in title IV.  
(k) "Rotogravure printing" means the application of words, designs, pictures, or  
surface coating to a substrate by means of a roll printing technique that involves intaglio  
or recessed image areas in the form of cells.  
History: 1980 AACS; 1981 AACS; 1989 AACS; 1992 AACS; 1995 AACS; 1996 AACS; 1997  
AACS; 2002 AACS; 2003 AACS; 2016 AACS.  
R 336.1119 Definitions; S.  
Rule 119. As used in these rules:  
(a) "Schedule of compliance" means, for purposes of R 336.1201 to R 336.1218, all  
of the following:  
(i) For a source not in compliance with all applicable requirements at the time of  
issuance of a renewable operating permit, a schedule of remedial measures, including an  
enforceable sequence of actions or operations that specifies milestones, leading to  
compliance with an applicable requirement, and a schedule for submission of certified  
progress reports, not less than every 6 months. The schedule must resemble, and be as  
stringent as, a schedule contained in a judicial consent decree or administrative order to  
which the source is subject. A schedule must be supplemental to, and not sanction  
noncompliance with, the applicable requirement on which it is based.  
(ii) For a source in compliance with all applicable requirements at the time of  
issuance of a renewable operating permit, a statement that the source will continue to  
comply with the requirements.  
(iii) With respect to any applicable requirement that has a future effective compliance  
date that is after the date of issuance and before the date of expiration of the renewable  
operating permit, the schedule of compliance must contain a statement that the source will  
meet the requirement on a timely basis, unless the underlying applicable requirement  
requires a more detailed schedule.  
(b) "Secondary emissions" means emissions that occur as a result of the construction  
or operation of a stationary source, but do not come from the stationary source itself.  
Secondary emissions include only emissions that are specific, well-defined, quantifiable,  
and impact the same general area as the stationary source which causes the secondary  
emissions. Secondary emissions also include emissions from any off-site support facility  
that would not otherwise be constructed or increase its emissions except as a result of the  
construction or operation of the stationary source. Examples of secondary emissions  
include the following:  
(i) Emissions from ships or trains coming to or going from a stationary source.  
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(ii) Emissions from any off-site support facility that would not otherwise be  
constructed or increase its emissions except as a result of the construction or operation of  
the stationary source.  
(c) "Secondary risk screening level" means the concentration of a possible, probable,  
or known human carcinogen in ambient air that is calculated, for regulatory purposes,  
according to the risk assessment procedures in R 336.1229(1), to produce an estimated  
upper-bound lifetime cancer risk of 1 in 100,000.  
(d) "Shutdown" means the cessation of operation of a source for any purpose.  
(e) "Significant" means a rate of emissions for the following air contaminants that  
would equal or exceed any of the following:  
(i) Carbon monoxide - 100 tons per year.  
(ii) Oxides of nitrogen - 40 tons per year.  
(iii) Sulfur dioxide - 40 tons per year.  
(iv) Particulate matter - 25 tons per year.  
(v) PM-10 - 15 tons per year.  
(vi) PM 2.5 - 10 tons per year, 40 tons per year of sulfur dioxide, or 40 tons per year  
of oxides of nitrogen.  
(vii) Volatile organic compounds - 40 tons per year.  
(viii) Lead - 0.6 tons per year.  
(ix) Fluorides - 3 tons per year.  
(x) Sulfuric acid mist - 7 tons per year.  
(xi) Hydrogen sulfide - 10 tons per year.  
(xii) Total reduced sulfur, including hydrogen sulfide - 10 tons per year.  
(xiii) Reduced sulfur compounds, including hydrogen sulfide - 10 tons per year.  
(xiv) Municipal waste combustor organics, measured as total tetra- through octa-  
chlorinated dibenzo-p-dioxins and dibenzofurans - 3.2x10-6 megagrams per year or  
3.2x10-6 tons per year.  
(xv) Municipal waste combustor metals, measured as particulate matter – 14  
megagrams per year or 15 tons per year.  
(xvi) Municipal waste combustor acid gases, measured as sulfur dioxide and  
hydrogen chloride - 36 megagrams per year or 40 tons per year.  
(xvii) Municipal solid waste landfill emissions, measured as nonmethane organic  
compounds - 45 megagrams per year or 50 tons per year.  
(f) "Smoke" means small gas and airborne particles consisting essentially of  
carbonaceous material in sufficient numbers to be observable.  
(g) "Sour condensate" means a condensate that emits sour gas at atmospheric  
pressure.  
(h) "Sour crude" means a crude oil that emits sour gas at atmospheric pressure.  
(i) "Sour gas" means any gas containing more than 1 grain of hydrogen sulfide or  
more than 10 grains of total sulfur per 100 standard cubic feet.  
(j) "Source sample" means any raw material, fuel, product, by-product, waste  
material, exhaust gas, air contaminant, flora, soil, or other material existing as a gas,  
liquid, or solid, which is captured, retained, or collected from a stationary source.  
(k) Reserved.  
(l) "Stack" or "chimney" means a flue, conduit, or duct arranged to conduct a gas  
stream to the outer air.  
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(m) "Standard conditions" means a gas temperature of 70 degrees Fahrenheit and a  
gas pressure of 29.92 inches of mercury absolute.  
(n) "Standpipe assembly," with respect to coke ovens, means the riser, standpipe lid,  
and the gooseneck.  
(o) "Standpipe assembly emission point," with respect to a coke oven battery  
equipped with a single collector main or a double collector main, means the flexible  
connection between the battery top and the base of the riser, the seating surface of the  
standpipe lid, and the second flexible connection wherever located, or another agreed  
upon connection that is located between the collector main and the gooseneck. With  
respect to a battery equipped with a charging main and a gas-offtake main in tandem,  
standpipe assembly emission point means the upper flange, the lower flange, the top lid,  
the bottom lid, the upper sand seal, the middle sand seal, and the lower base sand seal.  
With respect to a battery equipped with a jumper pipe ministandpipe, standpipe assembly  
emission point means the flexible connection between the battery top and the base of the  
riser, the seating surface of the standpipe lid, the flexible connection between the  
collector main and the gooseneck, the ministandpipe lid, and the flexible connection  
between the battery top and the jumper pipe ministandpipe.  
(p) "Start-up" means the setting in operation of a process or process equipment for  
any purpose.  
(q) “State-only enforceable” means that the limitation or condition is derived solely  
from the act and the air pollution control rules and is not federally enforceable. State-  
only enforceable requirements include R 336.1224, R 336.1225, R 336.1901, any permit  
requirement established solely pursuant to R 366.1201(1)(b), or another regulation that is  
enforceable solely under the act and is not federally enforceable.  
(r) "Stationary source" means all buildings, structures, facilities, or installations that  
emit or have the potential to emit 1 or more air contaminants, are located at 1 or more  
contiguous or adjacent properties, are under the control of the same person, and have the  
same 2-digit major group code associated with their primary activity. In addition, a  
stationary source includes buildings, structures, facilities, or installations that emit or  
have the potential to emit 1 or more air contaminants, are located at 1 or more contiguous  
or adjacent properties, are under the control of the same person, and have a different 2-  
digit major group code, but support the primary activity. Buildings, structures, facilities,  
or installations are considered to support the primary activity if 50% or more of their  
output is dedicated to the primary activity. Major group codes and primary activities are  
described in the standard industrial classification manual. Notwithstanding the  
provisions of this subdivision, research and development activities, as described in R  
336.1118, may be treated as a separate stationary source, unless the research and  
development activities support the primary activity of the stationary source.  
(s) "Stationary vessel" means any tank, reservoir, or container used for the storage of  
any volatile organic compound that is not used to transport volatile organic compounds  
and no manufacturing process or part thereof takes place.  
(t) "Stencil coat" means a coating that is applied over a stencil to a plastic part at a  
thickness of 1 mil or less of coating solids. Stencil coats are most frequently letters,  
numbers, or decorative designs.  
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(u) "Styrene devolatilizer unit" means equipment performing the function of  
separating unreacted styrene monomer and other volatile components from polystyrene in  
a vacuum devolatilizer.  
(v) "Styrene recovery unit" means equipment performing the function of separating  
styrene monomer from other less volatile components of the styrene devolatilizer unit's  
output. The separated styrene monomer may be reused as raw material in the  
manufacturing of polystyrene resin.  
(w) "Submerged fill pipe" means any fill pipe that has its discharge opening entirely  
submerged when the liquid level is 6 inches above the bottom of the vessel or, when  
applied to a vessel that is loaded from the side, means either of the following:  
(i) Any fill pipe that has its discharge opening entirely submerged when the liquid  
level is 18 inches above the bottom of the vessel.  
(ii) Any fill pipe that has its discharge opening entirely submerged when the liquid  
level is twice the diameter of the fill pipe above the bottom of the vessel, but the top of  
the submerged fill pipe must not be more than 36 inches above the bottom of the vessel.  
(x) "Sufficient evidence," a term of art, means either of the following:  
(i) In human epidemiological studies, that the data indicates that there is a causal  
relationship between the agent and human cancer.  
(ii) In animal studies, the data suggests that there is an increased incidence of  
malignant tumors or combined malignant and benign tumors in any of the following:  
(A) Multiple species or strains.  
(B) Multiple experiments.  
(C) To an unusual degree in a single experiment with regard to high incidence,  
unusual site or type of tumor, or early age at onset.  
(y) "Sulfuric acid plant" means any facility producing sulfuric acid by the contact  
process by burning elemental sulfur, alkylation acid, hydrogen sulfide, or acid sludge, but  
does not include facilities where conversion to sulfuric acid is utilized primarily as a  
means of preventing emissions to the atmosphere of sulfur dioxide or other sulfur  
compounds.  
(z) "Surface coating" means any paint, lacquer, varnish, ink, adhesive, or other  
coating material applied on a surface.  
(aa) "Sweet condensate" means any condensate that is not a sour condensate.  
(bb) "Sweet crude" means any crude oil that is not a sour crude.  
(cc) "Sweetening facility" means a facility or process that removes hydrogen sulfide  
or sulfur-containing compounds, or both, from a sour gas, sour crude oil, or sour  
condensate stream and converts it to sweet gas, sweet crude, or sweet condensate. The  
term sweetening facility does not include a facility or process that operates in an enclosed  
system and does not emit hydrogen sulfide to the outer air.  
(dd) "Sweet gas" means any gas that is not a sour gas.  
(ee) “Synthetic natural gas” means any manufactured fuel gas of approximately the  
same composition and heating value as that obtained naturally from geological  
formations beneath the Earth’s surface.  
(ff) "Synthetic organic chemical and polymer manufacturing plant" means a  
stationary source where the production, as intermediates or final products, of 1 or more of  
the following chemicals takes place:  
(i) Methyl tert-butyl ether.  
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(ii) Polyethylene.  
(iii) Polypropylene.  
(iv) Polystyrene.  
(v) Synthetic organic chemicals listed in "Standards of Performance for Equipment  
Leaks of VOC in the Synthetic Organic Chemicals Manufacturing Industry," 40 CFR part  
60, subpart VV, adopted by reference in R 336.1902.  
(gg) "Synthetic organic chemical and polymer manufacturing process unit" means  
all process equipment assembled to manufacture, as intermediates or final products, 1 or  
more of the chemicals listed in the definition of synthetic organic chemical and polymer  
manufacturing plant. A synthetic organic chemical and polymer manufacturing process  
unit can operate independently if supplied with sufficient feed or raw materials and  
sufficient storage facilities for the product.  
History: 1980 AACS; 1981 AACS; 1985 AACS; 1989 AACS; 1990 AACS; 1992 AACS; 1993  
AACS; 1995 AACS; 1996 AACS; 2003 AACS; 2012 AACS; 2016 AACS; 2025 MR 8, Eff. April 28,  
2025.  
R 336.1120 Definitions; T.  
Rule 120. As used in these rules:  
(a) "Temporary source" means a stationary source, process, or process equipment  
that commences operation and is located at a geographic site for not more than 12  
consecutive months.  
(b) "Texture coat" means a coating that is applied to a plastic part which, in its  
finished form, consists of discrete raised spots of the coating.  
(c) "Thin particleboard" means a manufactured board that is 1/4 of an inch or less in  
thickness and is made of individual wood particles that have been coated with a binder  
and formed into flat sheets by pressure.  
(d) "Thinning tank," as it pertains to R 336.1631, means any vessel that receives  
resin from a reactor and to which solvents or other materials are added to thin the resin.  
(e) "Tileboard" means paneling that has a colored, waterproof surface coating.  
(f) "Toxic air contaminant" means any air contaminant for which there is no national  
ambient air quality standard and is or may become harmful to public health or the  
environment when present in the outdoor atmosphere in sufficient quantities and  
duration. For the purpose of this definition, the following substances are not considered  
toxic air contaminants:  
(i) Acetylene.  
(ii) Animal or plant materials, including extracts and concentrates thereof, used as  
ingredients in food products or dietary supplements in accordance with applicable  
regulations of the United States Food and Drug Administration.  
(iii) Argon.  
(iv) Calcium carbonate.  
(v) Calcium hydroxide.  
(vi) Calcium oxide.  
(vii) Calcium silicate.  
(viii) Calcium sulfate.  
(ix) Carbon dioxide.  
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(x) Carbon monoxide.  
(xi) Cellulose.  
(xii) Crystalline silica emissions from any of the following processes:  
(A) Extraction and processing of all metallic or non-metallic minerals.  
(B) Sand production, processing, and drying.  
(C) Asphalt production.  
(D) Concrete production.  
(E) Glass and fiberglass manufacturing.  
(F) Foundries.  
(G) Foundry residual recovery activities.  
(xiii) Dipropylene glycol  
(xiv) Emery (corundite).  
(xv) Ethane.  
(xivi) Graphite (synthetic).  
(xvii) Grain dust.  
(xvii) Helium.  
(xix) Hydrogen.  
(xx) Iron oxide.  
(xxi) Lead.  
(xxii) Liquefied petroleum gas (l.p.g.).  
(xxiii) Methane.  
(xxiv) Neon.  
(xxv) Nitrogen.  
(xxvi) Nitrogen oxides.  
(xxvii) Oxygen.  
(xxviii) Ozone.  
(xxix) Perlite.  
(xxx) Portland cement.  
(xxxi) Propane.  
(xxxii) Propylene glycol.  
(xxxiii) Silicon.  
(xxxiv) Starch.  
(xxxv) Sucrose.  
(xxxvi) Sulfur dioxide.  
(xxxvii) Vegetable oil mist.  
(xxxviii) Water vapor.  
(xxxix) Zinc metal dust.  
(g) "Toxicological interaction" means the simultaneous exposure to 2 or more  
hazardous substances that together produce a toxicological response that is greater or less  
than what their individual responses would be.  
(h) "Transfer efficiency" means the percentage of coating solids material that leaves  
the coating applicator and remains on the surface of the product.  
(i) "True vapor pressure" means the equilibrium partial pressure exerted by a liquid  
or the sum of partial pressures exerted by a mixture of liquids. For refined petroleum  
stock, such as gasolines and naphthas, and crude oil, the true vapor pressure may be  
determined in accordance with methods described in American petroleum institute  
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MPMS C19 S2, "Manual of Petroleum Measurement Standards, Chapter 19, Evaporative  
Loss Measurements, Section 2, Evaporative Loss from Floating-roof Tanks," adopted by  
reference in R 336.1902.  
History: 1980 AACS; 1981 AACS; 1989 AACS; 1992 AACS; 1995 AACS; 1996 AACS;1999  
AACS; 2002 AACS; 2016 AACS; 2025 MR 8, Eff. April 28, 2025.  
R 336.1121 Definitions; U.  
Rule 121. As used in these rules:  
(a) "Uncontrolled emissions" means those emissions expected to occur without  
control equipment, unless such control equipment is, aside from air pollution control  
requirements, vital to production of the normal product of the process or to its normal  
operation. Annual uncontrolled emissions shall be based upon the maximum annually  
rated capacity of the process or process equipment, unless the process or process  
equipment is subject to legally enforceable permit conditions or orders which limit the  
operating rate or the hours of operation, or both. Legally enforceable permit conditions  
or orders on the type or amount of materials combusted or processed shall be used in  
determining the uncontrolled emissions rate of a process or process equipment.  
(b) "Unsafe-to-monitor component" means a component which, if monitored, would  
expose monitoring personnel to immediate danger. This definition includes, during the  
period of November 1 through March 31, a component which is located outside a  
building and which can only be monitored by elevating the monitoring personnel more  
than 6 feet above ground level.  
(c) “Used oil” means any oil that has been refined from crude oil, or any synthetic  
oil, that has been used and that, as a result of the use, is contaminated by physical or  
chemical impurities.  
History: 1981 AACS; 1989 AACS; 2016 AACS.  
R 336.1122 Definitions; V.  
Rule 122. As used in these rules:  
(a) "Vacuum-metalizing coatings" means topcoats and basecoats that are used in the  
vacuum-metalizing process.  
(b) "Vacuum-producing system" means any device that creates a pressure below  
atmospheric, such as a pump or steam ejector with condenser, including hot wells and  
accumulators.  
(c) "Vapor collection system," as it pertains to R 336.1627, means all piping, seals,  
hoses, connections, pressure-vacuum vents, and equipment between and including the  
delivery vessel and a stationary vessel, vapor processing unit, or vapor holder.  
(d) [Reserved]  
(e) "Visible emission" means any emissions that are visually detectable without the  
aid of instruments.  
(f) "Volatile organic compound" means any compound of carbon or mixture of  
compounds of carbon that participates in photochemical reactions, excluding the  
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following materials, all of which have been determined by the United States  
Environmental Protection Agency to have negligible photochemical reactivity:  
(i) Carbon monoxide (CAS No. 630-08-0).  
(ii) Carbon dioxide (CAS No. 124-38-9).  
(iii) Carbonic acid (CAS No. 463-79-6).  
(iv) Metallic carbides or carbonates (CAS No. not applicable).  
(v) Boron carbide (CAS No. 12069-32-8 or 60063-34-5).  
(vi) Silicon carbide (CAS No. 409-21-2 or 12327-32-1).  
(vii) Ammonium carbonate (CAS No. 10361-29-2 or 506-87-6).  
(viii) Ammonium bicarbonate (CAS No. 1066-33-7).  
(ix) Methane (CAS No. 74-82-8).  
(x) Ethane (CAS No. 74-84-0).  
(xi) The methyl chloroform (CAS No. 71-55-6) portion of commercial grades of  
methyl chloroform, if all of the following provisions are complied with:  
(A) The commercial grade of methyl chloroform is used only in a surface coating  
or coating line that is subject to the requirements part 6 or 7 of these rules.  
(B) The commercial grade of methyl chloroform contains no stabilizers other than  
those listed in table 11.  
(C) Compliance with the applicable limits specified in parts 6 or 7 of these rules is  
otherwise not technically or economically reasonable.  
(D) All measures to reduce the levels of all organic solvents, including the  
commercial grade of methyl chloroform, from the surface coating or coating line to the  
lowest reasonable level, are implemented.  
(E) The emissions of the commercial grade of methyl chloroform do not result in a  
maximum ambient air concentration exceeding any of the allowable ambient air  
concentrations listed in table 11.  
(F) The use of the commercial grade of methyl chloroform is specifically identified  
and allowed by a permit to install, permit to operate, or order of the department.  
(G) Table 11 reads as follows:  
TABLE 11.  
Commercial Grade of Methyl Chloroform -- Allowable Ambient Air Concentrations  
Compound  
Ppm1  
Time2  
Methyl chloroform  
Tertiary butyl alcohol3  
Secondary butyl alcohol3  
Methylal3  
3.5  
1.0  
1.0  
10.0  
0.028  
and  
1 hour  
1 hour  
1 hour  
1 hour  
1 hour  
1,2-butylene oxide3  
0.00041  
annual  
1
Parts per million, by volume  
Averaging time period  
This compound is a stabilizer  
2
3
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(xii) The methyl chloroform (CAS No. 71-55-6) portion of commercial grades of  
methyl chloroform that contain another stabilizer not listed in table 11 of this rule, if all  
of the following provisions are complied with:  
(A) The commercial grade of methyl chloroform is used only in a surface coating  
or coating line that is subject to the requirements of parts 6 or 7 of these rules.  
(B) Compliance with the applicable limits specified in parts 6 or 7 of these rules is  
otherwise not technically or economically reasonable.  
(C) All measures to reduce the levels of all organic solvents, including the  
commercial grade of methyl chloroform, from the surface coating or coating line to the  
lowest reasonable level are implemented.  
(D) The emissions of any compound in the commercial grade of methyl chloroform  
that is listed in table 11 of this rule do not result in a maximum ambient air concentration  
exceeding any of the allowable ambient air concentrations listed in table 11.  
(E) The emission of all compounds in the commercial grade of methyl chloroform  
that are not listed in table 11 is demonstrated to comply with R 336.1901.  
(F) The use of the commercial grade of methyl chloroform is specifically identified  
and allowed by a permit to install, permit to operate, or order of the department.  
(xiii) Acetone (CAS No. 67-64-1).  
(xiv) Cyclic, branched, or linear completely methylated siloxanes (CAS Nos.  
include 107-45-0, 107-51-7, 141-62-8, 141-63-9, 107-63-9, 63148-62-9, 541-05-9, 556-  
67-2, 541-02-6, 540-97-6, 69430-24-6, 17928-28-8, 3555-47-3).  
(xv) Parachlorobenzotrifluoride (CAS No. 98-56-6).  
(xvi) Perchloroethylene (CAS No. 127-18-4).  
(xvii) Trichlorofluoromethane (CFC-11) (CAS No. 75-69-4).  
(xviii) Dichlorodifluoromethane (CFC-12) (CAS No. 75-71-8).  
(xix) 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) (CAS No. 76-13-1).  
(xx) 1,2-dichloro 1,1,2,2-tetrafluoroethane (CFC-114) (CAS No. 76-14-2).  
(xxi) Chloropentafluoroethane (CFC-115) (CAS No. 76-15-3).  
(xxii) 1,1-dichloro 1-fluoroethane (HCFC-141b) (CAS No. 1717-00-6).  
(xxiii) 1,chloro 1,1-difluoroethane (HCFC-142b) (CAS No. 75-68-3).  
(xxiv) Chlorodifluoromethane (HCFC-22) (CAS No. 75-45-6).  
(xxv) 1,1,1-trifluoro 2,2-dichloroethane (HCFC-123) (CAS No. 306-83-2).  
(xxvi) 2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124) (CAS No. 2837-89-0).  
(xxvii) Trifluoromethane (HFC-23) (CAS No. 75-46-7).  
(xxviii) Pentafluoroethane (HFC-125) (CAS No. 354-33-6).  
(xxix) 1,1,2,2-tetrafluoroethane (HFC-134) (CAS No. 359-35-3).  
(xxx) 1,1,1,2-tetrafluoroethane (HFC-134a) (CAS No. 811-97-2).  
(xxxi) 1,1,1-trifluoroethane (HFC-143a) (CAS No. 420-46-2).  
(xxxii) 1,1-difluoroethane (HFC-152a) (CAS No. 75-37-6).  
(xxxiii) 3,3-dichloro-1, 1,1,2,2-pentafluoropropane (HCFC-225ca) (CAS No.  
422-56-0).  
(xxxiv) 1,3-dichloro-1,1,2,2,3-pentafluoropropane (HCFC-225cb) (CAS No.  
507-55-1).  
(xxxv) 1,1,1,2,3,4,4,5,5,5-decafluoropentane (HFC 43-10mee) (CAS No.  
138495-42-8).  
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(xxxvi) Difluoromethane (HFC-32) (CAS No. 75-10-5).  
(xxxvii) Ethyl fluoride (HFC-161) (CAS No. 353-36-6).  
(xxxviii) 1,1,1,3,3,3-hexafluoropropane (HFC-236fa) (CAS No. 690-39-1).  
(xxxix) 1,1,2,2,3-pentafluoropropane (HFC-245ca) (CAS No. 679-86-7).  
(xl) 1,1,2,3,3- pentafluoropropane ( HFC-245ea) (CAS No. 24270-66-4).  
(xli) 1,1,1,2,3- pentafluoropropane (HFC-245eb) (CAS No. 431-31-2).  
(xlii) 1,1,1,3,3- pentafluoropropane (HFC-245fa) (CAS No. 460-73-1).  
(xliii) 1,1,1,2,3,3-hexafluoropropane (HFC-236ea) (CAS No. 431-63-0).  
(xliv) 1,1,1,3,3-pentafluorobutane (HFC365mfc) (CAS No. 406-58-6).  
(xlv) Chlorofluoromethane (HCFC-31) (CAS No. 593-70-4).  
(xlvi) 1,2-dichloro-1,1,2-trifluoroethane (HCFC-123a) (CAS No. 354-23-4).  
(xlvii) 1-chlor-1-fluoroethane (HCFC-151a) (CAS No. 1615-75-4).  
(xlviii) 1,1,1,2,2,3,3,4,4-nonafluoro-4-methoxy-butane (C4F9OCH3 or HFE-7100)  
(CAS No. 163702-07-6).  
(xlix) 2-(difluoromethoxymethyl)-1,1,1,2,3,3,3-heptafluoropropane (CAS No.  
163702-08-7).  
(l) 1-ethoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane (C4F9OC2H5 or HFE-7200)  
(CAS No. 163702-05-4).  
(li)  
163702-06-5).  
(lii) Methyl acetate (CAS No. 79-20-9).  
2-(ethoxydifluoromethyl)-1,1,1,2,3,3,3-heptafluoropropane  
(CAS  
No.  
(liii) Perfluorocarbon compounds that fall into the following classes:  
(A) Cyclic, branched, or linear, completely fluorinated alkanes.  
(B) Cyclic, branched, or linear, completely fluorinated ethers with no  
unsaturations.  
(C) Cyclic, branched, or linear, completely fluorinated tertiary amines with no  
unsaturations.  
(D) Sulfur-containing perfluorocarbons with no unsaturations and with sulfur  
bonds only to carbon and fluorine.  
(liv) Methylene chloride (CAS No. 75-09-2).  
(lv) 1,1,1,2,2,3,3-heptafluoro-3-methoxy-propane (n-C3F7OCH3, HFE-7000)  
(CAS No. 375-03-1).  
(lvi) 3-ethoxy-1,1,1,2,3,4,4,5,5,6,6,6-dodecafluoro-2-(trifluoromethyl)  
(HFE 7500) (CAS No. 297730-93-9).  
hexane  
(lvii) 1,1,1,2,3,3,3-heptafluoropropane (HFC 227ea) (CAS No. 431-89-0).  
(lviii) Methyl formate (HCOOCH3) (CAS No. 107-31-3).  
(lix) T-butyl acetate (CAS No. 540-88-5).  
(lx) 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-trifluoromethyl-pentane (HFE-  
7300) (CAS No. 132182-92-4).  
(lxi) Dimethyl carbonate (CAS No. 616-38-6).  
(lxii) Propylene carbonate (CAS No. 108-32-7).  
(lxiii) 2,3,3,3-tetrafluoropropene (HFO–1234yf) (CAS No. 754-12-1).  
(lxiv) Trans-1,3,3,3-tetrafluoropropene (HFO–1234ze) (CAS No. 29118-24-9).  
(lxv) HCF2OCF2H (HFE-134) (CAS No. 1691-17-4).  
(lxvi) HCF2OCF2OCF2H (HFE-236cal2) (CAS No. 78522-47-1).  
(lxvii) HCF2OCF2CF2OCF2H (HFE-338pcc13) (CAS No. 188690-78-0).  
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(lxviii) HCF2OCF2OCF2CF2OCF2H (H-Galden 1040X or H-Galden ZT 130 (or  
150 or 180)) (CAS No. 188690-77-9).  
(lxix)  
(CAS No. 102687-65-0).  
(lxx) 2-amino-2-methyl-1-propanol (AMP) (CAS No. 124-68-5).  
(lxxi) 1,1,2,2-Tetrafluoro-1,-(2,2,2-trifluoroethoxy) ethane (HFE-347pcf2) (CAS  
No. 406-78-0).  
Trans  
1-chloro-3,3,3-trifluoroprop-1-ene  
(SolsticeTM  
1233zd(E))  
(lxxii) cis-1,1,1,4,4,4-hexafluorobut-2-ene (HFO-1336mzz-Z) (CAS No. 692-49-9).  
(lxxiii) trans-1,1,1,4,4,4-hexafluorobut-2-ene (HFO-1336mzz(E)) (CAS No. 66711-  
86-2).  
The methods described in R 336.2004 and R 336.2040 must be used for measuring  
volatile organic compounds for purposes of determining compliance with emission limits.  
Where a method also measures compounds with negligible photochemical reactivity,  
these negligibly-photochemical reactive compounds may be excluded as volatile organic  
compounds if the amount of the compounds is accurately quantified and the exclusion is  
approved by the department.  
History: 1980 AACS; 1985 AACS; 1988 AACS; 1989 AACS; 1993 AACS; 1997 AACS; 1998-2000  
AACS; 2003 AACS; 2008 AACS; 2012 AACS; 2016 AACS; 2025 MR 8, Eff. April 28, 2025.  
R 336.1123 Definitions; W.  
Rule 123. As used in these rules:  
(a) "Waxy, heavy pour crude oil" means any of the following:  
(i) A crude oil with a pour point of 30 degrees Fahrenheit or higher as determined by  
the standard test method set forth in ASTM-D97, entitled "Test Method for Pour Point of  
Petroleum Oils," adopted by reference in R 336.1902.  
(ii) A crude oil containing more than 2.5% N-paraffin content (C-17 to C-40).  
(iii) A crude oil with a viscosity of more than 500 seconds universal sayboldt (SUS)  
at 20 degrees Fahrenheit.  
(b) "Wayne county permit" means a permit or a certificate of operation issued  
pursuant to the Wayne county air pollution control ordinance adopted pursuant to the  
home rule charter for Wayne county, resolution no. 85-305, as amended by resolution  
no. 89-213.  
(c) "Weight of evidence," a term of art, means a description of the likelihood that a  
chemical is a human carcinogen based on evaluation of tumor data from human or  
animal studies and examination of relevant supporting information, including any of the  
following information:  
(i) Structure-activity relationships.  
(ii) Short-term test findings.  
(iii) Results of appropriate physiological, biological, and toxicological observations.  
(iv) Comparative metabolism and pharmacokinetic studies.  
History: 1981 AACS; 1992 AACS; 1995 AACS; 2016 AACS.  
R 336.1127 Terms defined in the act.  
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Rule 127. Terms defined in the act have the same meaning when used in these rules.  
History: 1980 AACS; 2016 AACS.  
R 336.1128 Rescission.  
Rule 128. R 336.11 to R 336.79, R 336.101 to R 336.116, and R 336.141 to R  
336.147 of the Michigan Administrative Code, appearing on pages 4191 to 4200 of the  
1967 Annual Supplement to the Code, pages 6147 to 6149 of the 1972 Annual  
Supplement to the Code, pages 6654 to 6657 and 6660 to 6662 of the 1973 Annual  
Supplement to the Code, pages 7249 to 7252 of the 1974 Annual Supplement to the  
Code, pages 7924 and 7925 of the 1975 Annual Supplement to the Code, and pages 76  
to 79 of Quarterly Supplement No. 94 to the Code, are rescinded.  
History: 1980 AACS.  
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;