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Sulfur Dioxide (1971) Designated Area Area/State/County Report
Sulfur Dioxide (1971) Designated Area Area/State/County Report
Data is current as of June 30, 2025| Ajo (Pima County), AZ (Primary - Maintenance) | |
| ARIZONA (Region IX) | |
| Pima County (P) | |
| Allegheny County Air Basin: Hazelwood monitor, PA (Primary - Maintenance) | |
| PENNSYLVANIA (Region III) | |
| Allegheny County (P) | |
| Armstrong County: Madison, Mahoning, Boggs, Washington, Pine, PA (Primary - Nonattainment) | |
| PENNSYLVANIA (Region III) | |
| Armstrong County (P) | |
| Madison Twp, Mahoning Twp, Boggs Twp, Washington Twp, Pine Twp | |
| Benton County; (part) TVA Johnsonville, TN (Primary, Secondary - Maintenance) | |
| TENNESSEE (Region IV) | |
| Benton County (P) | |
| TVA Johnsonville | |
| Boyd County (part), KY (Primary - Maintenance) | |
| KENTUCKY (Region IV) | |
| Boyd County (P) | |
| Brown County: Green Bay, WI (Primary - Maintenance) | |
| WISCONSIN (Region V) | |
| Brown County (P) | |
| Central Steptoe Valley, NV (Primary - Maintenance) | |
| NEVADA (Region IX) | |
| White Pine County (P) | |
| Colbert County (part); TVA Colbert Plant, AL (Secondary - Maintenance) | |
| ALABAMA (Region IV) | |
| Colbert County (P) | |
| Coshocton County; Franklin Township, OH (Primary - Maintenance) | |
| OHIO (Region V) | |
| Coshocton County (P) | |
| Franklin Township | |
| Cuyahoga County, OH (Primary - Maintenance) | |
| OHIO (Region V) | |
| Cuyahoga County (P) | |
| Dane County: Madison sub-city area, WI (Primary - Maintenance) | |
| WISCONSIN (Region V) | |
| Dane County (P) | |
| Douglas (Cochise County), AZ (Primary - Maintenance) | |
| ARIZONA (Region IX) | |
| Cochise County (P) | |
| East Helena Area, MT (Primary, Secondary - Maintenance) | |
| MONTANA (Region VIII) | |
| Lewis and Clark County (P) | |
| Gallia County; Addison Township, OH (Secondary - Maintenance) | |
| OHIO (Region V) | |
| Gallia County (P) | |
| Addison Township | |
| Grant County, NM (Primary - Maintenance) | |
| NEW MEXICO (Region VI) | |
| Grant County (P) | |
| AQCR 012: Portions of Grant County | |
| Hancock County (part): Weirton, WV (Primary, Secondary - Maintenance) | |
| WEST VIRGINIA (Region III) | |
| Hancock County (P) | |
| The city of Weirton, including Butler and Clay Magisterial Districts. | |
| Hayden (Pinal County), AZ (Primary - Nonattainment) | |
| ARIZONA (Region IX) | |
| Pinal County (P) | |
| Humphreys County; (part) TVA Johnsonville, TN (Primary, Secondary - Maintenance) | |
| TENNESSEE (Region IV) | |
| Humphreys County (P) | |
| TVA Johnsonville | |
| Jefferson County; (part) Steubenville & Mingo Junction, OH (Primary - Maintenance) | |
| OHIO (Region V) | |
| Jefferson County (P) | |
| La Porte County, IN (Primary - Maintenance) | |
| INDIANA (Region V) | |
| LaPorte County (P) | |
| Lake County, IN (Primary - Maintenance) | |
| INDIANA (Region V) | |
| Lake County (P) | |
| Lake County; (part) Eastlake, Timberlake, Lakeline, Willoughby, Mentor, OH (Primary - Maintenance) | |
| OHIO (Region V) | |
| Lake County (P) | |
| Eastlake, Timberlake, Lakeline, Willoughby, and Mentor | |
| Lauderdale County (part); TVA Colbert Plant, AL (Secondary - Maintenance) | |
| ALABAMA (Region IV) | |
| Lauderdale County (P) | |
| Laurel Area (Yellowstone County), MT (Primary - Nonattainment) | |
| MONTANA (Region VIII) | |
| Yellowstone County (P) | |
| Lorain County, OH (Primary - Maintenance) | |
| OHIO (Region V) | |
| Lorain County (P) | |
| Lucas County, OH (Primary - Maintenance) | |
| OHIO (Region V) | |
| Lucas County (P) | |
| Marathon County: Rothschild Sub-city area, Rib Mountain, Weston, WI (Primary, Secondary - Maintenance) | |
| WISCONSIN (Region V) | |
| Marathon County (P) | |
| Marion County: Lawrence, Washington, and Warrant Townships, IN (Primary - Maintenance) | |
| INDIANA (Region V) | |
| Marion County (P) | |
| The area included within Lawrence, Washington, and Warren Townships. | |
| Miami (Gila County), AZ (Primary - Maintenance) | |
| ARIZONA (Region IX) | |
| Gila County (P) | |
| Millinocket AQCR 109, ME (Primary - Maintenance) | |
| MAINE (Region I) | |
| Penobscot County (P) | |
| Milwaukee, WI (Primary - Maintenance) | |
| WISCONSIN (Region V) | |
| Milwaukee County (P) | |
| Minneapolis-St. Paul, MN (Primary - Maintenance) | |
| MINNESOTA (Region V) | |
| Anoka County | |
| Carver County | |
| Dakota County | |
| Hennepin County | |
| Ramsey County | |
| Scott County | |
| Washington County | |
| Morenci (Greenlee County), AZ (Primary - Maintenance) | |
| ARIZONA (Region IX) | |
| Greenlee County (P) | |
| Morgan County: Center Township, OH (Secondary - Maintenance) | |
| OHIO (Region V) | |
| Morgan County (P) | |
| Muhlenberg County, KY (Secondary - Maintenance) | |
| KENTUCKY (Region IV) | |
| Muhlenberg County | |
| Muscatine County, IA (Primary - Maintenance) | |
| IOWA (Region VII) | |
| Muscatine County (P) | |
| New Manchester-Grant magisterial district in Hancock County, WV (Primary - Maintenance) | |
| WEST VIRGINIA (Region III) | |
| Hancock County (P) | |
| New Manchester-Grant magisterial district in Hancock County. | |
| Olmsted County; City of Rochester, MN (Primary - Maintenance) | |
| MINNESOTA (Region V) | |
| Olmsted County (P) | |
| City of Rochester | |
| Oneida County: Rhinelander Sub-city area, WI (Primary, Secondary - Maintenance) | |
| WISCONSIN (Region V) | |
| Oneida County (P) | |
| Peoria County: Hollis twp, IL (Primary, Secondary - Maintenance) | |
| ILLINOIS (Region V) | |
| Peoria County (P) | |
| Peoria, IL (Primary - Maintenance) | |
| ILLINOIS (Region V) | |
| Peoria County (P) | |
| Piti, GU (Primary - Nonattainment) | |
| GUAM (Region IX) | |
| Guam (P) | |
| Polk County, TN (Primary, Secondary - Maintenance) | |
| TENNESSEE (Region IV) | |
| Polk County | |
| Salt Lake County, UT (Primary, Secondary - Nonattainment) | |
| UTAH (Region VIII) | |
| Salt Lake County | |
| San Manual (Pinal County), AZ (Primary - Maintenance) | |
| ARIZONA (Region IX) | |
| Pinal County (P) | |
| Tanguisson, GU (Primary - Nonattainment) | |
| GUAM (Region IX) | |
| Guam (P) | |
| Tazewell County: Groveland twp, IL (Primary - Maintenance) | |
| ILLINOIS (Region V) | |
| Tazewell County (P) | |
| Tooele County, UT (Primary, Secondary - Nonattainment) | |
| UTAH (Region VIII) | |
| Tooele County (P) | |
| Portions of Tooele County | |
| Vigo County, IN (Primary - Maintenance) | |
| INDIANA (Region V) | |
| Vigo County | |
| Warren County, NJ (Primary, Secondary - Maintenance) | |
| NEW JERSEY (Region II) | |
| Warren County (P) | |
| Northeast Pennsylvania-Upper Delaware Valley Interstate AQCR | |
| Warren County: Conewago Twp, PA (Primary - Maintenance) | |
| PENNSYLVANIA (Region III) | |
| Warren County (P) | |
| Conewango Twp. | |
| Warren County: Warren Boro, Pleasant Twp, Glade Twp, PA (Primary, Secondary - Maintenance) | |
| PENNSYLVANIA (Region III) | |
| Warren County (P) | |
| Warren Boro, Pleasant Twp, Glade Twp | |
| Washington County: Waterford Township, OH (Secondary - Maintenance) | |
| OHIO (Region V) | |
| Washington County (P) | |
| Wayne County: Boston, Center, Franklin, Wayne & Webster Townships, IN (Primary - Maintenance) | |
| INDIANA (Region V) | |
| Wayne County (P) | |
| Boston, Center, Franklin, Wayne, and Webster Twps | |
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