FOR INCLUSION IN WYOMING STATE IMPLEMENTATION PLAN 

FROM WYOMING AIR QUALITY STANDARDS AND REGULATIONS 

Common Provisions 

CHAPTER! 

Section 3. Definitions. 

(a) The definitions contained in Section 35-502.3, Wyoming Environmental 

Quality Act shall be applicable, where appropriate. The following terms as used in these 

standards and regulations shall, unless the context otherwise requires, have the following 

meanings: 

'~dministrator" means Administrator of the Division of Air Quality, Wyoming 

Department ofEnvironmental Quality. 

'~ir contaminant" shall mean dust, fumes, mist, smoke, other particulate matter, 

vapor, gas or any combination of the foregoing, but shall not include steam or water 

vapor. 

'~ir pollution" shall mean the presence in the outdoor atmosphere of one or more 

air contaminants in such quantities and duration as is materially injurious to human health 

or welfare, animal or plant life or property, or unreasonably interferes with the enjoyment 

of life or property. 

'~nimal matter" shall mean any product or derivative of animal life. 

"Board" shall mean the Air Quality Advisory Board. 

"Control equipment" shall mean any device, contrivance, or system which 

prevents or reduces emissions. 

"Control officer" shall mean the Director of the State Department of 

Environmental Quality, or the Administrator of the Air Quality Division, or any 

employee of the Division designated by the Administrator, or any local health officer or 

employee designated by the Administrator. 

"Council" shall mean the Environmental Quality Council. 

"Department" shall mean the Wyoming Department of Environmental Quality. 

"Director" shall mean the Director of the Wyoming Department of 

Environmental Quality. 

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"Division" shall mean the Air Quality Division, Wyoming Department of 

Environmental Quality. 

"Emission" shall mean a release into the outdoor atmosphere of air contaminants. 

"Equivalent method" shall mean any procedure, practice, policy, system or 

device which can be demonstrated to produce a result adequate for the purpose required 

in these regulations and consistent with specified reference methods. 

"Existing equipment" shall mean equipment installed prior to the effective date 

of an applicable regulation. 

"Existing source" means any stationary or portable source other than a new 

source. 

"Facility" shall mean any property, real or personal, which may incorporate one 

or more sources of air pollution and shall include but not be limited to processing plants, 

manufacturing plants, power generator plants, refining plants, mining operations, lumber 

mills, ore processing plants, construction material processing operations, etc. 

"Fuel burning equipment" shall mean any furnace, boiler apparatus, stack, or 

appurtenances thereto used in the process of burning fuel or other combustible material 

for the purpose of producing heat or power by indirect heat transfer. 

~~Greenhouse gases (GHGs)" means the air pollutant defined as the aggregate 

group of six greenhouse gases: carbon dioxide, nitrous oxide, methane, 

hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride. 

"Incinerator" shall mean any equipment, device or contrivance used for the 

destruction of garbage, rubbish or other wastes by burning, but not wood wastes burned 

in devices commonly called tepee burners, silos, truncated cones, wigwam burners and 

other such burners used commonly by the wood products industry. 

"Initial start-up" shall mean that point in time when a source or group of sources 

actually begins operation for the purpose of generating goods or services as an end 

product or as an intermediate product. Start-up of a source to check functional operation 

ofthe "machinery" shall not be construed as initial start-up. 

"Installation" shall mean any property, real or personal, including but not limited 

to processing equipment, manufacturing equipment, fuel burning equipment, incinerators, 

or any other equipment, or construction, capable of creating or causing emissions. 

"Maximum design production rate" shall mean the maximum production rate at 

which a source is designed for continuous or batch operation and for which the permit is 

applied. 

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"Modification" shall mean any physical change in, or change in the method of 

operation of, an affected facility which increases the amount of any air pollutant (to 

which any state standards applies) emitted by such facility or which results in the 

emission of any such air pollutant not previously emitted. 

"Motor vehicle" shall mean those vehicles carrying people or goods on public 

streets or highways. 

~~Multiple chamber incinerator" shall mean any article, machine, equipment, 

contrivance, structure or part of a structure used to dispose of combustible refuse by 

burning, consisting of two or more combustion furnaces in series physically separated by 

walls, interconnected by gas passage ports or ducts and employing adequate parameters 

necessary for maximum combustion of the material to be burned. 

"New equipment" shall mean: 

(i) Any equipment, installation, construction article, machine or 

contrivance ordered, constructed or installed after the effective date of an applicable 

regulation; 

(ii) Any equipment replaced or altered or processes changed in such a 

manner after the effective date of an applicable regulation as to have an effect of 

increasing the production of air contaminants; 

(iii) Any equipment moved after the effective date of this regulation to 

another premise involving a change of address when said move will cause or would be 

expected to cause an increase in the production of air contaminants; 

(iv) Any equipment purchased and to be operated after the effective date 

of this regulation by a new owner or when a new lessee desires to operate such 

equipment. 

"New source" shall mean any stationary or portable source, the construction or 

modification of which is commenced after the effective date of regulations prescribing a 

standard of performance applicable to such source. 

"Odor" shall mean that property of an emission which stimulates the sense of 

smell. 

"Open burning" shall mean a fire where any material is burned in the open or in 

a receptacle other than a furnace, incinerator, or other equipment connected to a stack or 

chimney. 

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"Owner or operator" shall mean any person who owns, leases, operates, controls, 

or supervises a facility, building, structure, or installation which directly or indirectly 

result or may result in emissions of any air contaminant. 

"Particulate matter": 

(i) "Particulate matter" shall mean any airborne finely divided solid or 

liquid material with an aerodynamic diameter smaller than I 00 micrometers. 

(ii) "Particulate matter emissions" shall mean all finely divided solid or 

liquid material, other than uncombined water, emitted to the ambient air as measured by 

applicable reference methods, specified in 40 CFR part 60, Appendix A. 

(iii) "PM10" shall mean particulate matter with an aerodynamic diameter 

less than or equal to a nominal I 0 micrometers as measured by a reference method based 

on Appendix J of 40 CFR part 50, and designated in accordance with 40 CFR part 53. 

(iv) "PM10 emissions" shall mean finely divided solid or liquid material, 

with an aerodynamic diameter less than or equal to a nominal I 0 micrometers emitted to 

the ambient air as measured by an applicable reference method, or an equivalent or 

alternate method approved by the Administrator. 

(v) "Total suspended particulates (TSP)" shall mean particulate matter as 

measured by the method described in Appendix B to 40 CFR part 50. 

"Person" means any individual, partnership, firm, association, municipality, 

public or private corporation, sub-division or agency ofthe state, trust, estate or any other 

legal entity. 

"Premises" shall mean any property, piece of land or real estate or building. 

"Process weight" shall mean the total weight of all materials introduced into any 

specific process which may cause emissions. Solid fuels charged will be considered as 

part of the process weight but liquids and gaseous fuels, combustion air, and water will 

not. However, water included as part of the normal charge to a beet pulp dryer process 

shall be considered as part of the process weight. 

"Reduction" shall mean any heated process, including rendering, cooking, 

drying, dehydrating, digesting, evaporating, and protein concentrating. 

"Salvage operation" shall mean any operation conducted in whole or in part for 

the salvaging or reclaiming of any product or material. 

"Source" shall mean any property, real or personal, or person contributing to air 

pollution. 

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"Stack or chimney" shall mean any flue, conduit or duct arranged to conduct 

emissions. 

"Standard conditions" shall mean a temperature of 68° Fahrenheit and pressure 

reduced to 29.92 inches of mercury at sea level. 

"Trade wastes" shall mean solid, liquid, or gaseous material resulting from 

construction or the prosecution of any business, trade or industry, or any demolition 

operation including but not limited to wood, plastics, cartons, grease, oil, chemicals and 

cinders. 

"Wood waste burners" shall mean devices commonly called tepee burners, silos, 

truncated cones, wigwam burners, and other such burners commonly used by the wood 

product industry for the disposal by burning of wood wastes. 

Section 7. Greenhouse gases. 

(a) Sources that directly emit, or have the potential to emit the pollutant 

Greenhouse Gases (GHGs) shall be subject to operating permit requirements as specified 

in Chapter 6, Section 3, and subject to prevention of significant deterioration (PSD) 

permit requirements as specified in Chapter 6, Section 4. 

(b) Notwithstanding the requirements of Chapter 6, Section 2(a)(i) and (iii), a 

preconstruction permit under Chapter 6, Section 2 is not required for the pollutant 

Greenhouse Gases (GHGs) unless the facility or source is also required to obtain a permit 

for GHGs under Chapter 6, Section 4. 

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