CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES > SUBPART C—Section 107 Attainment Status Designations (§81.300 to §81.356) > 81.351—Wyoming.

81.351—Wyoming.

Wyoming—SO2
Designated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards
Entire State X
Wyoming—Carbon Monoxide
Designated Area Designation Classification
Date 1 Type Date 1 Type
Statewide Unclassifiable/Attainment
Albany County
Big Horn County
Campbell County
Carbon County
Converse County
Crook County
Fremont County
Goshen County
Hot Springs County
Johnson County
Laramie County
Lincoln County
Natrona County
Niobrara County
Park County
Platte County
Sheridan County
Sublette County
Sweetwater County
Teton County
Uinta County
Washakie County
Weston County
1 This date is November 15, 1990, unless otherwise noted.
Wyoming—Ozone (1-Hour Standard)2
Designated area Designation Classification
Date 1 Type Date 1 Type
Statewide Unclassifiable/Attainment
Albany County
Big Horn County
Campbell County
Carbon County
Converse County
Crook County
Fremont County
Goshen County
Hot Springs County
Johnson County
Laramie County
Lincoln County
Natrona County
Niobrara County
Park County
Platte County
Sheridan County
Sublette County
Sweetwater County
Teton County
Uinta County
Washakie County
Weston County
1 This date is October 18, 2000, unless otherwise noted.
2 The 1-hour ozone standard is revoked effective June 15, 2005 for all areas in Wyoming.
Wyoming—PM-10
Designated Area Designation Classification
Date Type Date Type
Sheridan County:
City of Sheridan 11/15/90 Nonattainment 11/15/90 Moderate.
Trona Industrial Area 11/15/90 Unclassifiable
Campbell County (part) 11/15/90 Unclassifiable
Converse County (part).
That area bounded by Township 40 through 52 North, and Ranges 69 through 73 West, inclusive of the Sixth Principal Meridian, Campbell and Converse Counties, excluding the areas defined as the Pacific Power and Light Area, the Hampshire Energy Area, and the Kennecott/Puron PSD Baseline Area—Powder River Basin.
Campbell County (part), That areabounded by NW1/4 of Section 27, T50N, R71W, Campbell County, Wyoming—Pacific Power and Light Area 11/15/90 Unclassifiable
Campbell County (part), That area bounded by Section 6 excluding the SW1/4; E1/2 Section 7; Section 17 excluding the SW1/4; Section 14 excluding the SE1/4; Sections 2, 3, 4, 5, 8, 9, 10, 11, 15, 16 of T48N, R70W and Section 26 excluding the NE1/4; SW1/4 Section 23; Sections 19, 20, 21, 22, 27, 28, 29, 30, 31, 32, 33, 34, 35 of T49N, R70W.—Hampshire Energy Area 11/15/90 Unclassifiable
Campbell County (part), That area described by the W1/2SW1/4 Section 18, W1/2NW1/4, NW1/4SW1/4 Section 19, T47N, R70W, S1/2 Section 13, N1/2, N1/2SW1/4, N1/2SE1/4 Section 24, T47N, R71W.—Kennecott/Puron PSD Baseline Area 11/15/90 Unclassifiable
Rest of State1 11/15/90 Unclassifiable
1 Denotes a single area designation for baseline area purposes.
Wyoming—NO2
Designated area Does not meet primary standards Cannot be classified or better than national standards
Entire State X
Wyoming—Ozone (8-Hour Standard)
Designated area Designation a Category/classification
Date 1 Type Date 1 Type
Statewide Unclassifiable/Attainment
Albany County Unclassifiable/Attainment
Big Horn County Unclassifiable/Attainment
Campbell County Unclassifiable/Attainment
Carbon County Unclassifiable/Attainment
Converse County Unclassifiable/Attainment
Crook County Unclassifiable/Attainment
Fremont County Unclassifiable/Attainment
Goshen County Unclassifiable/Attainment
Hot Springs County Unclassifiable/Attainment
Johnson County Unclassifiable/Attainment
Laramie County Unclassifiable/Attainment
Lincoln County Unclassifiable/Attainment
Natrona County Unclassifiable/Attainment
Niobrara County Unclassifiable/Attainment
Park County Unclassifiable/Attainment
Platte County Unclassifiable/Attainment
Sheridan County Unclassifiable/Attainment
Sublette County Unclassifiable/Attainment
Sweetwater County Unclassifiable/Attainment
Teton County Unclassifiable/Attainment
Uinta County Unclassifiable/Attainment
Washakie County Unclassifiable/Attainment
Weston County Unclassifiable/Attainment
a Includes Indian Country located in each county or area, except as otherwise specified.
1 This date is June 15, 2004, unless otherwise noted.
Wyoming—PM2.5 (Annual NAAQS)
Designated area Designation a
Date 1 Type
Casper, WY:
Natrona County (part) Unclassifiable/Attainment.
The portion within the City of Casper
Cheyenne, WY:
Laramie County (part) Unclassifiable/Attainment.
The portion within the City of Cheyenne
Evanston, WY:
Uinta County (part) Unclassifiable/Attainment.
The portion within the City of Evanston
Gillette, WY:
Campbell County (part) Unclassifiable/Attainment.
The portion within the City of Gillette
Jackson, WY:
Teton County (part) Unclassifiable/Attainment.
The portion within the City of Jackson
Lander, WY:
Fremont County (part) Unclassifiable/Attainment.
The portion within the City of Lander
Laramie, WY:
Albany County (part) Unclassifiable/Attainment.
The portion within the City of Laramie
Riverton, WY:
Fremont County (part) Unclassifiable/Attainment.
The portion within the City of Riverton
Rock Springs, WY:
Sweetwater County (part) Unclassifiable/Attainment.
The portion within the City of Rock Springs
Sheridan, WY:
Sheridan County (part) Unclassifiable/Attainment.
The portion within the City of Sheridan
Rest of State:
Code of Federal Regulations 555
Albany County (remainder) Unclassifiable/Attainment.
Big Horn County Unclassifiable/Attainment.
Campbell County Unclassifiable/Attainment.
Carbon County Unclassifiable/Attainment.
Converse County Unclassifiable/Attainment.
Crook County Unclassifiable/Attainment.
Fremont County (remainder) Unclassifiable/Attainment.
Goshen County Unclassifiable/Attainment.
Hot Springs County Unclassifiable/Attainment.
Johnson County Unclassifiable/Attainment.
Laramie County (remainder) Unclassifiable/Attainment.
Lincoln County Unclassifiable/Attainment.
Natrona County (remainder) Unclassifiable/Attainment.
Niobrara County Unclassifiable/Attainment.
Park County Unclassifiable/Attainment.
Platte County Unclassifiable/Attainment.
Sheridan County (remainder) Unclassifiable/Attainment.
Sublette County Unclassifiable/Attainment.
Sweetwater County Unclassifiable/Attainment.
Teton County (remainder) Unclassifiable/Attainment.
Uinta County (remainder) Unclassifiable/Attainment.
Washakie County Unclassifiable/Attainment.
Weston County Unclassifiable/Attainment.
a Includes Indian Country located in each county or area, except as otherwise specified.
1 This date is 90 days after January 5, 2005, unless otherwise noted.
Wyoming—PM2.5 [24-hour NAAQS]
Designated area Designation for the 1997 NAAQS a Designation for the 2006 NAAQS a
Date 1 Type Date 2 Type
Casper, WY:
Natrona County (part) Unclassifiable/Attainment Unclassifiable/Attainment.
The portion within the City of Casper.
Cheyenne, WY:
Laramie County (part) Unclassifiable/Attainment Unclassifiable/Attainment.
The portion within the City of Cheyenne.
Evanston, WY:
Uinta County (part) Unclassifiable/Attainment Unclassifiable/Attainment.
The portion within the City of Evanston.
Gillette, WY:
Campbell County (part) Unclassifiable/Attainment Unclassifiable/Attainment.
The portion within the City of Gillette.
Jackson, WY:
Teton County (part) Unclassifiable/Attainment Unclassifiable/Attainment.
The portion within the City of Jackson.
Lander, WY:
Fremont County (part) Unclassifiable/Attainment Unclassifiable/Attainment.
The portion within the City of Lander.
Laramie, WY:
Albany County (part) Unclassifiable/Attainment Unclassifiable/Attainment.
The portion within the City of Laramie.
Riverton, WY:
Fremont County (part) Unclassifiable/Attainment Unclassifiable/Attainment.
The portion within the City of Riverton.
Code of Federal Regulations 556
Rock Springs, WY:
Sweetwater County (part) Unclassifiable/Attainment Unclassifiable/Attainment.
The portion within the City of Rock Springs.
Sheridan, WY:
Sheridan County (part) Unclassifiable/Attainment Unclassifiable/Attainment.
The portion within the City of Sheridan.
Rest of State:
Albany County (remainder) Unclassifiable/Attainment Unclassifiable/Attainment.
Big Horn County Unclassifiable/Attainment Unclassifiable/Attainment.
Campbell County Unclassifiable/Attainment Unclassifiable/Attainment.
Carbon County Unclassifiable/Attainment Unclassifiable/Attainment.
Converse County Unclassifiable/Attainment Unclassifiable/Attainment.
Crook County Unclassifiable/Attainment Unclassifiable/Attainment.
Fremont County (remainder) Unclassifiable/Attainment Unclassifiable/Attainment.
Goshen County Unclassifiable/Attainment Unclassifiable/Attainment.
Hot Springs County Unclassifiable/Attainment Unclassifiable/Attainment.
Johnson County Unclassifiable/Attainment Unclassifiable/Attainment.
Laramie County (remainder) Unclassifiable/Attainment Unclassifiable/Attainment.
Lincoln County Unclassifiable/Attainment Unclassifiable/Attainment.
Natrona County (remainder) Unclassifiable/Attainment Unclassifiable/Attainment.
Niobrara County Unclassifiable/Attainment Unclassifiable/Attainment.
Park County Unclassifiable/Attainment Unclassifiable/Attainment.
Platte County Unclassifiable/Attainment Unclassifiable/Attainment.
Sheridan County (remainder) Unclassifiable/Attainment Unclassifiable/Attainment.
Sublette County Unclassifiable/Attainment Unclassifiable/Attainment.
Sweetwater County Unclassifiable/Attainment Unclassifiable/Attainment.
Teton County (remainder) Unclassifiable/Attainment Unclassifiable/Attainment.
Uinta County (remainder) Unclassifiable/Attainment Unclassifiable/Attainment.
Washakie County Unclassifiable/Attainment Unclassifiable/Attainment.
Weston County Unclassifiable/Attainment Unclassifiable/Attainment.
a Includes Indian Country located in each county or area, except as otherwise specified.
1 This date is 90 days after January 5, 2005, unless otherwise noted.
2 This date is 30 days after November 13, 2009, unless otherwise noted.

Code of Federal Regulations

[43 FR 8964, Mar. 3, 1978, as amended at 47 FR 31878, July 23, 1982; 48 FR 54483, Dec. 5, 1983; 56 FR 56853, Nov. 6, 1991; 57 FR 56778, Nov. 30, 1992; 58 FR 4350, Jan. 14, 1993; 60 FR 55798, 55800, Nov. 3, 1995; 61 FR 47060, Sept. 6, 1996; 63 FR 31093, June 5, 1998; 65 FR 45271, July 20, 2000; 69 FR 23948, Apr. 30, 2004; 70 FR 1016, Jan. 5, 2005; 70 FR 44478, Aug. 3, 2005; 74 FR 58778, Nov. 13, 2009]