Skip to main content

Code of Federal Regulations Title 40. Protection of Environment § 40.81.351 Wyoming

Welcome to FindLaw's Cases & Codes, a free source of state and federal court opinions, state laws, and the United States Code. For more information about the legal concepts addressed by these cases and statutes, visit FindLaw's Learn About the Law.

Wyoming—1971 Sulfur Dioxide NAAQS (Primary and Secondary)

Designated area

Does not meet primary standards

Does not meet secondary standards

Cannot be classified

Better than national standards

Entire State

X

Wyoming—2010 Sulfur Dioxide NAAQS

[Primary]

Designated area 1

Designation

Date 2

Type

Albany County

Attainment/Unclassifiable.

Big Horn County

Attainment/Unclassifiable.

Campbell County

Attainment/Unclassifiable.

Carbon County

4/30/2021

Attainment/Unclassifiable.

Converse County

4/30/2021

Attainment/Unclassifiable.

Crook County

Attainment/Unclassifiable.

Fremont County (part)

Attainment/Unclassifiable.

All areas west of the western border of Township 40North-Range 93West, T39N-R93W, and T38N-R93W, and south of U.S. Route 20.

Freemont County (remainder)

4/30/2021

Attainment/Unclassifiable.

Goshen County

Attainment/Unclassifiable.

Hot Springs County

Attainment/Unclassifiable.

Johnson County

Attainment/Unclassifiable.

Lincoln County

Attainment/Unclassifiable.

Natrona County

Attainment/Unclassifiable.

Niobrara County

Attainment/Unclassifiable.

Park County

Attainment/Unclassifiable.

Platte County

Attainment/Unclassifiable.

Sheridan County

Attainment/Unclassifiable.

Sublette County

Attainment/Unclassifiable.

Sweetwater County (part)

Attainment/Unclassifiable.

All areas of the county east of U.S. Route 191.

Sweetwater County (remainder)

4/30/2021

Attainment/Unclassifiable.

Teton County

Attainment/Unclassifiable.

Uinta County

Attainment/Unclassifiable.

Washakie County

Attainment/Unclassifiable.

Weston County

Attainment/Unclassifiable.

1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.

2 This date is April 9, 2018, unless otherwise noted.

Wyoming—Carbon Monoxide

Designation

Classification

Designated Area

Date1

Type

Date1

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

Date1

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

5/4/2018

Attainment

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 area bounded by NW 1/4 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 SW 1/4; E 1/2 Section 7; Section 17 excluding the SW 1/4; Section 14 excluding the SE 1/4; Sections 2, 3, 4, 5, 8, 9, 10, 11, 15, 16 of T48n, R70w and Section 26 excluding the NE 1/4; SW 1/4 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 W 1/2 SW 1/4 Section 18, W 1/2 NW 1/4, NW 1/4 SW 1/4 Section 19, T47N, R70W, S 1/2 Section 13, N 1/2, N 1/2 SW 1/4, N 1/2 SE 1/4 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—1997 Annual PM2.5 NAAQS

[Primary and secondary]

Designated area

Designation a

Classification

Date 1

Type

Date

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:

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—2012 Annual PM2.5 NAAQS

[Primary]

Designated area 1

Designation

Classification

Date 2

Type

Date 2

Type

Statewide:

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

1 Includes areas of Indian country located in each county or area, except as otherwise specified.

2 This date is April 15, 2015, unless otherwise noted.

Wyoming—1997 24-Hour PM2.5 NAAQS

[Primary and secondary]

Designated area

Designation a

Classification

Date 1

Type

Date

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:

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—2006 24-Hour PM2.5 NAAQS

[Primary and secondary]

Designated area

Designation a

Classification

Date 1

Type

Date

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:

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 30 days after November 13, 2009, unless otherwise noted.

Wyoming—NO2 (1971 Annual Standard)

Designated area

Does not meet primary standards

Cannot be classified or better than national standards

Entire State

X

Wyoming—NO2 (2010 1-Hour Standard)

Designated area

Designation a

Date 1

Type

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 90 days after October 31, 2011, unless otherwise noted.

Wyoming—1997 8–Hour Ozone NAAQS (Primary and Secondary)

Designation a

Category/classification

Designated area

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—2008 8-Hour Ozone NAAQS

[Primary and secondary]

Designated area

Designation

Classification

Date 1

Type

Date 1

Type

Upper Green River Basin Area, WY: 2

Nonattainment

Marginal.

Lincoln County (part)

The area of the county north and east of the boundary defined by a line starting at the point defined by the intersection of the southwest corner Section 30 Range (R) 115 West Township (T) 27N and the northwest corner of Section 31 R 115 West T27N of Sublette County at Sublette County's border with Lincoln County. From this point the boundary moves to the west 500 feet to Aspen Creek. The boundary follows the centerline of Aspen Creek downstream to the confluence of Aspen Creek and Fontenelle Creek (in R116W T26N, Section 1). From this point the boundary moves generally to the south along the centerline of Fontenelle Creek to the confluence of Fontenelle Creek and Roney Creek (in R115W T24N Section 6). From the confluence, the boundary moves generally to the east along the centerline of Fontenelle Creek and into the Fontenelle Reservoir (in R112W T24N Section 6). The boundary moves east southeast along the centerline of the Fontenelle Reservoir and then toward the south along the centerline of the Green River to where the Green River in R111W T24N Section 31 crosses into Sweetwater County.

Sublette County

Sweetwater County (part)

The area of the county west and north of the boundary which begins at the midpoint of the Green River, where the Green River enters Sweetwater County from Lincoln County in R111W T24N Section 31. From this point, the boundary follows the center of the channel of the Green River generally to the south and east to the confluence of the Green River and the Big Sandy River (in R109W T22N Section 28). From this point, the boundary moves generally north and east along the centerline of the Big Sandy River to the confluence of the Big Sandy River with Little Sandy Creek (in R106W T25N Section 33). The boundary continues generally toward the northeast along the centerline of Little Sandy Creek to the confluence of Little Sandy Creek and Pacific Creek (in R106W T25N Section 24). From this point, the boundary moves generally to the east and north along the centerline of Pacific Creek to the confluence of Pacific Creek and Whitehorse Creek (in R103W T26N Section 10). From this point the boundary follows the centerline of Whitehorse Creek generally to the northeast until it reaches the eastern boundary of Section 1 R103W T26N. From the point where Whitehorse Creek crosses the eastern section line of Section 1 R103W T26N, the boundary moves straight north along the section line to the southeast corner of Section 36 R103W T27N in Sublette County where the boundary ends.

Rest of State and Rest of Indian Country

Unclassifiable/Attainment

1 This date is July 20, 2012, unless otherwise noted.

2 Excludes Indian country located in each area, unless otherwise noted.

Wyoming—2015 8-Hour Ozone NAAQS

[Primary and Secondary]

Designated area 1

Designation

Classification

Date 2

Type

Date 2

Type

Albany County

Attainment/Unclassifiable

Big Horn County

1/16/18

Attainment/Unclassifiable

Campbell County

1/16/18

Attainment/Unclassifiable

Carbon County

1/16/18

Attainment/Unclassifiable

Converse County

1/16/18

Attainment/Unclassifiable

Crook County

1/16/18

Attainment/Unclassifiable

Fremont County

1/16/18

Attainment/Unclassifiable

Goshen County

1/16/18

Attainment/Unclassifiable

Hot Springs County

1/16/18

Attainment/Unclassifiable

Johnson County

1/16/18

Attainment/Unclassifiable

Laramie County

Attainment/Unclassifiable

Lincoln County

1/16/18

Attainment/Unclassifiable

Natrona County

1/16/18

Attainment/Unclassifiable

Niobrara County

1/16/18

Attainment/Unclassifiable

Park County

1/16/18

Attainment/Unclassifiable

Platte County

1/16/18

Attainment/Unclassifiable

Sheridan County

1/16/18

Attainment/Unclassifiable

Sublette County

1/16/18

Attainment/Unclassifiable

Sweetwater County

1/16/18

Attainment/Unclassifiable

Teton County

1/16/18

Attainment/Unclassifiable

Uinta County

1/16/18

Attainment/Unclassifiable

Washakie County

1/16/18

Attainment/Unclassifiable

Weston County

1/16/18

Attainment/Unclassifiable

1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.

2 This date is August 3, 2018, unless otherwise noted.

Wyoming—2008 Lead NAAQS

Designated area

Designation for the 2008 NAAQS a

Date 1

Type

Whole State

Unclassifiable/Attainment.

a Includes Indian Country located in each county or area, except as otherwise specified.

1 December 31, 2011 unless otherwise noted.

Cite this article: FindLaw.com - Code of Federal Regulations Title 40. Protection of Environment § 40.81.351 Wyoming - last updated October 03, 2022 | https://codes.findlaw.com/cfr/title-40-protection-of-environment/cfr-sect-40-81-351/


FindLaw Codes may not reflect the most recent version of the law in your jurisdiction. Please verify the status of the code you are researching with the state legislature or via Westlaw before relying on it for your legal needs.

Was this helpful?

Thank you. Your response has been sent.

Copied to clipboard