Sulfur Dioxide (1971) Maintenance Areas (Redesignated from Nonattainment)
Data is current as of November 30, 2025
Grouped by Designation
| PRIMARY |
| Ajo (Pima County), AZ |
| Allegheny County Air Basin: Hazelwood monitor, PA |
| Boyd County (part), KY |
| Brown County: Green Bay, WI |
| Central Steptoe Valley, NV |
| Coshocton County; Franklin Township, OH |
| Cuyahoga County, OH |
| Dane County: Madison sub-city area, WI |
| Douglas (Cochise County), AZ |
| Grant County, NM |
| Jefferson County; (part) Steubenville & Mingo Junction, OH |
| La Porte County, IN |
| Lake County, IN |
| Lake County; (part) Eastlake, Timberlake, Lakeline, Willoughby, Mentor, OH |
| Lorain County, OH |
| Lucas County, OH |
| Marion County: Lawrence, Washington, and Warrant Townships, IN |
| Miami (Gila County), AZ |
| Millinocket AQCR 109, ME |
| Milwaukee, WI |
| Minneapolis-St. Paul, MN |
| Morenci (Greenlee County), AZ |
| Muscatine County, IA |
| New Manchester-Grant magisterial district in Hancock County, WV |
| Olmsted County; City of Rochester, MN |
| Peoria, IL |
| San Manual (Pinal County), AZ |
| Tazewell County: Groveland twp, IL |
| Vigo County, IN |
| Warren County: Conewago Twp, PA |
| Wayne County: Boston, Center, Franklin, Wayne & Webster Townships, IN |
| |
| PRIMARY, SECONDARY |
| Benton County; (part) TVA Johnsonville, TN |
| East Helena Area, MT |
| Hancock County (part): Weirton, WV |
| Humphreys County; (part) TVA Johnsonville, TN |
| Marathon County: Rothschild Sub-city area, Rib Mountain, Weston, WI |
| Oneida County: Rhinelander Sub-city area, WI |
| Peoria County: Hollis twp, IL |
| Polk County, TN |
| Warren County, NJ |
| Warren County: Warren Boro, Pleasant Twp, Glade Twp, PA |
| |
| SECONDARY |
| Colbert County (part); TVA Colbert Plant, AL |
| Gallia County; Addison Township, OH |
| Lauderdale County (part); TVA Colbert Plant, AL |
| Morgan County: Center Township, OH |
| Muhlenberg County, KY |
| Washington County: Waterford Township, OH |
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