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FOR INCLUSION IN WYOMING STATE IMPLEMENTATION PLAN

FROM WYOMING AIR QUALITY STANDARDS AND REGULATIONS

General Emission Standards

CHAPTER 3

Section 2. Emission standards for particulate matter.

(a) Visible emissions of any contaminant discharged into the atmosphere from 

any single new source of emission whatsoever as determined by a qualified observer shall 

be limited to 20 percent opacity;

Provided, however, that: 

(i) An owner or operator of an affected facility of the type described in 

Chapter 3, Section 2(h)(i) hereof which has a heat input of not less than 2500 x 106 Btu 

per hour, may request the Administrator of the Division of Air Quality to determine 

opacity of emissions from such affected facility during initial performance tests required 

by Chapter 6, Section 2(i) or during other performance tests thereafter.

(ii) Upon receipt from such owner or operator of the written report of the 

results of the performance tests required by Chapter 6, Section 2(i) or later performance 

tests, the Administrator will make a finding concerning compliance with opacity and 

other applicable standards. If the Administrator finds that such affected facility is in 

compliance with all applicable standards for which performance tests are conducted but 

fails to meet any applicable opacity standard, he shall notify the owner or operator and 

advise him that he may petition the Administrator within 10 days of receipt of 

notification to make appropriate adjustment to the opacity standard for such affected 

facility.

(iii) The Administrator will grant such a petition upon a satisfactory 

demonstration by the owner or operator that such affected facility and associated air 

pollution control equipment was operated and maintained in a manner to minimize the 

opacity of emissions during the performance tests; that the performance tests were 

performed under the conditions prescribed by the Administrator; and that such affected 

facility and associated air pollution control equipment were incapable of being adjusted 

or operated to meet the applicable opacity standard at or near the facility’s designed 

capacity.

(iv) The Administrator will establish an opacity standard for such affected 

facility meeting the above requirements at a level at which the source will be able, as 

indicated by the performance and opacity tests, to meet the opacity standard at all times 
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during which the source is meeting the mass or concentration emission standard and 

during which the facility and air pollution equipment is being operated properly and 

maintained to minimize the opacity of emissions and mass emission rate.

(b) Visible emissions of any contaminant discharged into the atmosphere from 

any single existing source of emission whatsoever as determined by a qualified observer 

shall be limited to 40 percent opacity. This limitation shall not apply to existing 

incinerators or wood waste burners.

(c) The emission of visible air pollutants from gasoline engines shall be 

eliminated except for periods not exceeding five consecutive seconds.

(d) The emission of visible air pollutants from stationary or portable diesel 

engines as determined by a qualified observer shall be limited to 30 percent opacity 

below 7500 feet elevation except for periods not exceeding ten consecutive seconds. 

(e) Any single source may discharge for a period or periods aggregating not more 

than 6 minutes in any hour contaminants;

(i) Having an equivalent opacity of not more than 40 percent as 

determined by a qualified observer.

(f) The emission of fugitive dust shall be limited by all persons handling, 

transporting, or storing any material to prevent unnecessary amounts of particulate matter 

from becoming airborne to the extent that ambient air standards described in these 

regulations are exceeded. Control measures described as follows or any equivalent 

method shall be considered appropriate for such control:

(i) Use, where possible, of water or chemicals for control of dust in the 

demolition of existing buildings, or structures, construction operations, the grading of 

roads or the clearing of land;

(ii) Application of asphalt, oil, water, or suitable chemicals on dirt roads, 

materials stockpiles, and other surfaces which can give rise to airborne dusts;

(iii) Installation and use of hood, fans and fabric filters to enclose and 

vent the handling of dusty materials; adequate containment methods shall be employed 

during sandblasting or other similar operations;

(iv) Covering, at all times when in motion, open bodied trucks, 

transporting materials likely to give rise to airborne dust;

(v) Conduct of agricultural practices such as tilling of land, application of 

fertilizers, etc. in such a manner as to prevent dust from becoming airborne;

(vi) The paving of roadways and their maintenance in a clear condition;
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(vii) The prompt removal of earth or other material from paved streets 

onto which earth or other material has been transported by trucking or earth moving 

equipment, erosion by water, or other means.

(g) The emission of particulate matter from any new source shall be limited as 

indicated in Table I. The emission of particulate matter from any existing source shall be 

limited as indicated in Table II.

(i) Process weight per hour means the total weight of all materials 

introduced into any specific process that may cause any emissions of particulate matter, 

including solid fuels, but excluding liquids or gases and used solely as fuels, and 

excluding air introduced for purposes of combustion, and excluding the weight of any 

water, water vapor or steam that may be introduced as part of the total materials. 

However, water contained as part of the normal input to a beet pulp dryer process shall be 

included as part of the process weight per hour.

(ii) For a cyclical or batch operation, the process weight per hour is 

derived by dividing the total process weight by the number of hours in one complete 

operation from the beginning of any given process to the completion thereof, excluding 

any time during which the equipment is idle.

(iii) For a continuous operation, the process weight per hour is derived by 

dividing the process weight for a typical period of time.

(iv) Emission tests related to this regulation shall be measured in 

accordance with the requirements of Chapter 3, Section 2(h)(iv).

TABLE I

PROCESS

WEIGHT

RATE

(lbs/hr)

EMISSION

RATE

(lbs/hr)

50 0.36

100 0.55

500 1.53

1,000 2.25

5,000 6.34

10,000 9.73

20,000 14.99

60,000 29.60

80,000 31.19

120,000 33.28

160,000 34.85
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200,000 36.11

400,000 40.35

1,000,000 46.72

Interpolation of the data in Table I for the process weight rates up to 60,000 lbs/hr shall 

be accomplished by the use of the equation:

E = 3.59 P0.62 P ≤ 30 tons/hr

and interpolation and extrapolation of the data for process weight rates in excess of 

60,000 lbs/hr shall be accomplished by use of the equation:

E = 17.31 P0.16 P > 30 tons/hr

Where: E = Emissions in pounds per hour.

P = Process weight rate in tons per hour.

TABLE II

PROCESS WEIGHT

RATE

RATE OF

EMISSION

PROCESS WEIGHT

RATE

RATE OF

EMISSION

lb/hr tons/hr lb/hr lb/hr tons/hr lb/hr

100 0.05 0.551 16,000 8 16.5

200 0.10 0.877 18,000 9 17.9

400 0.20 1.40 20,000 10 19.2

600 0.30 1.83 30,000 15 25.2

800 0.40 2.22 40,000 20 30.5

1,000 0.50 2.58 50,000 25 35.4

1,500 0.75 3.38 60,000 30 40.0

2,000 1.00 4.10 70,000 35 41.3

2,500 1.25 4.76 80,000 40 42.5

3,000 1.50 5.38 90,000 45 43.6

3,500 1.75 5.96 100,000 50 44.6

4,000 2.00 6.52 120,000 60 46.3

5,000 2.50 7.58 140,000 70 47.8

6,000 3.00 8.56 160,000 80 49.0

7,000 3.50 9.49 200,000 100 51.2

8,000 4.00 10.4 1,000,000 500 69.0

9,000 4.50 11.2 2,000,000 1,000 77.6

10,000 5.00 12.0 6,000,000 3,000 92.7

12,000 6.00 13.6

Interpolation of the data in Table II for process weight rates up to 60,000 lb/hr 

shall be accomplished by use of the equation E = 4.10 P0.67, and interpolation and 
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extrapolation of the data for process weight rates in excess of 60,000 lb/hr shall be 

accomplished by use of the equation:

E = 55.0 P0.11- 40, where E = rate of emission in lb/hr

and P = process weight rate in tons/hr

Notwithstanding any other provision of this Table, any existing air contaminant 

source utilizing an air pollution control device having a collection efficiency of 99.5 

percent or better, shall be deemed to be in compliance with all provisions of this 

regulation. Such efficiency shall be determined by a professional engineer licensed to 

practice in Wyoming and all expenses incurred in such determination shall be defrayed 

by the person responsible for the emission.

FIGURE 1 PARTICULATE EMISSION LIMITS

(h) The emissions of particulate matter from existing sources where fuel burning 

equipment is used for indirect heating shall be limited as shown in Figure 1 and shall be 

applicable to equipment burning solid fuel. The emissions of particulate matter from new 

sources where fuel burning equipment is used for indirect heating shall be limited to 0.10 

pound per million Btu input (0.18 grams per million calories) maximum 2-hour average. 

The visible emissions of particulate matter from new sources where fuel burning 

equipment is used for indirect heating shall be no greater than 20 percent opacity, except 

that 40 percent opacity shall be permitted for not more than 2 minutes in any hour. This 

regulation is not applicable to residential or commercial fuel burning equipment with a 

heat input of less than 10 x 106 Btu/hr and used exclusively to produce building heat.
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(i) This regulation applies to installations in which fuel is burned for the 

primary purpose of producing steam, hot water, or hot air or other indirect heating of 

liquids, gases, or solids, and, in the course of doing so, the products of combustion do not 

come into direct contact with process materials. Fuels include those such as coal, coke, 

lignite, fuel oil, and wood, but do not include refuse. When any products or byproducts 

of a manufacturing process are burned for the same purpose or in conjunction with any 

fuel, the same maximum emission limitations shall apply.

(ii) The heat content of coal shall be determined according to the ASTM 

method D-271-64 Laboratory Sampling and Analysis of Coal and Coke or ASTM method 

D-2015-62T Gross Calorific Value of Solid Fuel by the Adiabatic Bomb Calorimeter, 

which publications are made a part of this regulation by reference.

(iii) For purposes of this regulation, the heat input shall be the aggregate

heat content of all fuels whose products of combustion pass through a stack or stacks, or 

the heat input value used shall be the equipment manufacturer or designer’s guaranteed 

maximum input, whichever is greater. The total heat input of all fuel burning units at a 

plant or on a premise shall be used for determining the maximum allowable amount of 

particulate matter which may be emitted.

(iv) The amount of particulate matter emitted shall be measured by source 

test methods specified by the Administrator. The reference methods shall be test methods 

1 through 5, Appendix A, 40 CFR part 60.

(i) The emission of particulate matter from any incinerator shall be limited to:

(i) 0.20 pound per 100 pounds (2 grams per kilogram) of refuse charged 

as determined by a source test method approved by the Division for stationary sources as 

described in Subsection (g)(iv) of this regulation;

(ii) A shade or density equal to but not greater than 20 percent opacity as 

determined by a qualified observer.

(j) Where the presence of uncombined water is the only reason for failure of an 

emission to meet the opacity requirements of Chapter 3, Section 2 of this regulation, such 

opacity requirements shall not apply.

Section 9. Incorporation by reference.

(a) Code of Federal Regulations (CFR). All Code of Federal Regulations (CFR), 

including their Appendices, cited in this Chapter, revised and published as of July 1,

2012, not including any later amendments, are incorporated by reference. Copies of the 

Code of Federal Regulations are available for public inspection and copies can be

obtained at cost from the Department of Environmental Quality, Division of Air Quality, 

122 W. 25th Street, Cheyenne, Wyoming 82002. Copies of the CFRs can also be 
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obtained at cost from Government Institutes, 15200 NBN Way, Building B, Blue Ridge 

Summit, PA 17214.

(b) American Society for Testing and Materials (ASTM). All ASTM standards

cited in this Chapter, revised and published as of July 1, 2012, not including any later 

amendments, are incorporated by reference. Copies of the ASTM standards are available 

for public inspection and copies can be obtained at cost from the Department of 

Environmental Quality, Division of Air Quality, 122 W. 25th Street, Cheyenne, Wyoming 

82002. Copies can also be obtained at cost from the American Society for Testing and 

Materials, 100 Barr Harbor Drive, Post Office Box C700, West Conshohocken, PA 

19428-2959.