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PM-10 (1987) Designated Area/State Information
PM-10 (1987) Designated Area/State Information
Data is current as of March 31, 2025| Area Name | State | Current Status | Current Classification or at Redesignation |
No. Counties |
2010 Population |
EPA Region |
|---|---|---|---|---|---|---|
|
Click underlined column heading to change report order. click area name for state/county list |
click for Classification history |
|||||
Total Areas |
Total Counties |
Total Population (2010) |
||||
| Nonattainment | 21 | 19 | 7,190,423 | |||
| Maintenance | 68 | 77 | 33,390,743 | |||
| Nonattainment and Maintenance | 89 | 87 | 40,581,166 | |||
| Ada County; Boise, ID | ID | Maintenance | Moderate | 1 | 240,254 | 10 |
| Adams, Denver, and Boulder Counties; Denver Metropolitan area, CO | CO | Maintenance | Moderate | 7 | 2,770,524 | 08 |
| Allegheny County; Liberty, Lincoln, Port Vue, Glassport, Clairton, P | PA | Maintenance | Moderate | 1 | 18,700 | 03 |
| Anchorage; Eagle River, AK | AK | Maintenance | Moderate | 1 | 219,193 | 10 |
| Archuleta County; Pagosa Springs, CO | CO | Maintenance | Moderate | 1 | 2,261 | 08 |
| Aroostock County; City of Presque Isle, ME | ME | Maintenance | Moderate | 1 | 972 | 01 |
| Bonner County; The Sandpoint Area, ID | ID | Maintenance | Moderate | 1 | 40,876 | 10 |
| Brooke; Follansbee area, WV | WV | Maintenance | Moderate | 1 | 2,674 | 03 |
| Clark County; Las Vegas planning area, NV | NV | Maintenance | Serious | 1 | 1,951,248 | 09 |
| Cochise County; Paul Spur/Douglas planning area, AZ | AZ | Nonattainment | Moderate | 1 | 17,495 | 09 |
| Cook County; Lyons Township, IL | IL | Maintenance | Moderate | 1 | 111,688 | 05 |
| Cook County; Southeast Chicago, IL | IL | Maintenance | Moderate | 1 | 3,117 | 05 |
| Coso Junction, CA | CA | Maintenance | Moderate | 1 | 7,333 | 09 |
| Cuyahoga County, OH | OH | Maintenance | Moderate | 1 | 1,280,122 | 05 |
| Dona Ana County; Anthony, NM | NM | Nonattainment | Moderate | 1 | 3,096 | 06 |
| East Kern County, CA | CA | Nonattainment | Serious | 1 | 125,950 | 09 |
| El Paso County, TX | TX | Nonattainment | Moderate | 1 | 649,121 | 06 |
| Flathead County; Columbia Falls and vicinity, MT | MT | Maintenance | Moderate | 1 | 4,610 | 08 |
| Flathead County; Kalispell and vicinity, MT | MT | Maintenance | Moderate | 1 | 18,422 | 08 |
| Flathead County; Whitefish and vicinity, MT | MT | Maintenance | Moderate | 1 | 6,138 | 08 |
| Fremont County; Canon City Area, CO | CO | Maintenance | Moderate | 1 | 18,860 | 08 |
| Gila County (part): Payson, AZ | AZ | Maintenance | Moderate | 1 | 5,333 | 09 |
| Hancock and Brooke Counties (Part); The city of Weirton, WV | WV | Maintenance | Moderate | 2 | 14,199 | 03 |
| Hayden, AZ | AZ | Nonattainment | Moderate | 2 | 11,048 | 09 |
| Imperial Valley, CA | CA | Maintenance | Serious | 1 | 146,905 | 09 |
| Indian Wells, CA | CA | Maintenance | Moderate | 1 | 15,449 | 09 |
| Inyo County; Owens Valley planning area, CA | CA | Nonattainment | Serious | 1 | 7,333 | 09 |
| Jackson County; Medford-Ashland (including White City), OR | OR | Maintenance | Moderate | 1 | 87,458 | 10 |
| Jefferson County, OH | OH | Maintenance | Moderate | 1 | 3,472 | 05 |
| Josephine County; Grants Pass, OR | OR | Maintenance | Moderate | 1 | 22,449 | 10 |
| Juneau; Mendenhall Valley area, AK | AK | Maintenance | Moderate | 1 | 14,030 | 10 |
| King County; Kent, WA | WA | Maintenance | Moderate | 1 | 47,315 | 10 |
| King County; Seattle, WA | WA | Maintenance | Moderate | 1 | 661,062 | 10 |
| Klamath Falls, OR | OR | Maintenance | Moderate | 1 | 20,703 | 10 |
| LaSalle County; Oglesby, IL | IL | Maintenance | Moderate | 1 | 3,862 | 05 |
| Lake County (part); Lakeview, OR | OR | Maintenance | Moderate | 1 | 3,296 | 10 |
| Lake County; Cities of East Chicago, Hammond, Whiting, and Gary, IN | IN | Maintenance | Moderate | 1 | 214,867 | 05 |
| Lake County; Polson, MT | MT | Nonattainment | Moderate | 1 | 4,099 | 08 |
| Lake County; Ronan, MT | MT | Nonattainment | Moderate | 1 | 2,734 | 08 |
| Lane County (part); Oakridge, OR | OR | Maintenance | Moderate | 1 | 3,728 | 10 |
| Lane County; Eugene/Springfield, OR | OR | Maintenance | Moderate | 1 | 195,160 | 10 |
| Lincoln County; Libby and vicinity, MT | MT | Maintenance | Moderate | 1 | 3,378 | 08 |
| Madison County; Granite City Township and Nameoki Township, IL | IL | Maintenance | Moderate | 1 | 35,652 | 05 |
| Maricopa and Pinal Counties; Phoenix planning area, AZ | AZ | Nonattainment | Serious | 2 | 3,852,985 | 09 |
| Miami, AZ | AZ | Nonattainment | Moderate | 2 | 15,218 | 09 |
| Missoula, MT | MT | Maintenance | Moderate | 1 | 59,733 | 08 |
| Mohave County (part); Bullhead City, AZ | AZ | Maintenance | Moderate | 1 | 10,710 | 09 |
| Mono Basin, CA | CA | Nonattainment | Moderate | 1 | 285 | 09 |
| Mono County; Mammoth Lake planning area, CA | CA | Maintenance | Moderate | 1 | 7,133 | 09 |
| Mun. of Guaynabo, PR | PR | Maintenance | Moderate | 1 | 90,470 | 02 |
| New York County, NY | NY | Nonattainment | Moderate | 1 | 1,585,873 | 02 |
| Ogden, UT | UT | Maintenance | Moderate | 1 | 82,825 | 08 |
| Olmsted County, MN | MN | Maintenance | Moderate | 1 | 96,199 | 05 |
| Pierce County; Tacoma, WA | WA | Maintenance | Moderate | 1 | 238,725 | 10 |
| Pima County; Ajo planning area, AZ | AZ | Maintenance | Moderate | 1 | 8,823 | 09 |
| Pima County; Rillito planning area, AZ | AZ | Nonattainment | Moderate | 1 | 588 | 09 |
| Pinal County (part); West Pinal, AZ | AZ | Nonattainment | Serious | 1 | 283,032 | 09 |
| Pitkin County; Aspen, CO | CO | Maintenance | Moderate | 1 | 6,772 | 08 |
| Power-Bannock Counties; Fort Hall Indian Reservation, ID | ID | Nonattainment | Moderate | 2 | 591 | 10 |
| Power-Bannock Counties; Portneuf Valley Area, ID | ID | Maintenance | Moderate | 2 | 72,396 | 10 |
| Prowers County; Lamar, CO | CO | Maintenance | Moderate | 1 | 7,523 | 08 |
| Ramsey County, MN | MN | Maintenance | Moderate | 1 | 284,783 | 05 |
| Riverside County; Coachella Valley planning area, CA | CA | Nonattainment | Serious | 1 | 257,794 | 09 |
| Riverside, Los Angeles, Orange, & San Bernardino Counties; South Coa | CA | Maintenance | Serious | 4 | 15,799,134 | 09 |
| Rosebud County; Lame Deer, MT | MT | Nonattainment | Moderate | 1 | 527 | 08 |
| Routt County (part); Steamboat Springs, CO | CO | Maintenance | Moderate | 1 | 12,088 | 08 |
| Sacramento County, CA | CA | Maintenance | Moderate | 1 | 1,418,788 | 09 |
| Salt Lake County, UT | UT | Maintenance | Moderate | 1 | 1,029,655 | 08 |
| San Bernardino County, CA | CA | Nonattainment | Moderate | 1 | 237,418 | 09 |
| San Joaquin Valley Air Basin, CA | CA | Maintenance | Serious | 8 | 3,830,257 | 09 |
| San Miguel County; Telluride, CO | CO | Maintenance | Moderate | 1 | 2,014 | 08 |
| Sanders County (part); Thompson Falls and vicinity, MT | MT | Maintenance | Moderate | 1 | 1,317 | 08 |
| Santa Cruz County; Nogales planning area, AZ | AZ | Nonattainment | Moderate | 1 | 30,359 | 09 |
| Sheridan County; City of Sheridan, WY | WY | Maintenance | Moderate | 1 | 17,300 | 08 |
| Shoshone County; City of Pinehurst, ID | ID | Maintenance | Moderate | 1 | 1,578 | 10 |
| Shoshone County; Pinehurst Expansion Area, ID | ID | Maintenance | Moderate | 1 | 9,691 | 10 |
| Silver Bow County; Butte, MT | MT | Maintenance | Moderate | 1 | 34,201 | 08 |
| Spokane County, WA | WA | Maintenance | Moderate | 1 | 230,807 | 10 |
| Thurston County; Cities of Olympia, Tumwater, and Lacey, WA | WA | Maintenance | Moderate | 1 | 98,562 | 10 |
| Trona, CA | CA | Nonattainment | Moderate | 1 | 4,167 | 09 |
| Union County; LaGrande, OR | OR | Maintenance | Moderate | 1 | 13,094 | 10 |
| Utah County, UT | UT | Maintenance | Moderate | 1 | 516,564 | 08 |
| Vermillion County; Part of Clinton Township, IN | IN | Maintenance | Moderate | 1 | 9,119 | 05 |
| Walla Walla County; Wallula, WA | WA | Maintenance | Serious | 1 | 426 | 10 |
| Washoe County; Reno planning area, NV | NV | Maintenance | Serious | 1 | 421,404 | 09 |
| Wayne County, MI | MI | Maintenance | Moderate | 1 | 713,777 | 05 |
| Yakima County, WA | WA | Maintenance | Moderate | 1 | 69,565 | 10 |
| Yuma, AZ | AZ | Nonattainment | Moderate | 1 | 100,710 | 09 |
County subtotals and grand totals may not equal sum of the counties. Part counties are only counted one time within groupings. Multi-state areas are counted only once in area totals, and are counted in maintenance totals when all states in the area have been redesignated.
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