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Data is current as of December 31, 2021

Ajo (Pima County), AZ
Aspen, CO
Boise-Northern Ada County, ID
Bonner Co (Sandpoint), ID
Butte, MT
Canon City, CO
Clairton & 4 Boroughs, PA
Clark Co, NV
Coachella Valley, CA
Columbia Falls, MT
Coso Junction, CA
Cuyahoga Co, OH
Denver Metro, CO
Eagle River, AK
East Chicago, IN
East Kern Co, CA
Eugene-Springfield, OR
Flathead County; Whitefish and vicinity, MT
Follansbee, WV
Fort Hall Indian Reservation
Granite City, Nameoki Twsp, IL
Grants Pass, OR
Hayden, AZ
Imperial Valley, CA
Indian Wells, CA
Jefferson Co, OH
Juneau, AK
Kalispell, MT
Kent, WA
King Co, WA
Klamath Falls, OR
LaGrande, OR
Lake Co, OR
Lamar, CO
Lane Co, OR
Libby, MT
Los Angeles South Coast Air Basin, CA
Lyons Twsp., IL
Mammoth Lake, CA
Medford-Ashland, OR
Miami, AZ
Missoula, MT
Mohave Co, AZ
Mono Basin, CA
Mun. of Guaynabo, PR
New Haven Co, CT
New York Co, NY
Nogales, AZ
Ogden, UT
Oglesby, IL
Olmsted Co, MN
Olympia, Tumwater, Lacey, WA
Owens Valley, CA
Pagosa Springs, CO
Paul Spur/Douglas (Cochise County), AZ
Payson, AZ
Phoenix, AZ
Pierce Co, WA
Pinehurst, ID
Portneuf Valley, ID
Presque Isle, ME
Ramsey Co, MN
Rillito, AZ
Sacramento Co, CA
Salt Lake Co, UT
San Bernardino Co, CA
San Joaquin Valley Air Basin, CA
Sanders County (part); Thompson Falls and vicinity, MT
Sheridan, WY
Shoshone Co, ID
Southeast Chicago, IL
Spokane Co, WA
Steamboat Springs, CO
Telluride, CO
Trona, CA
Utah Co, UT
Vermillion Co, IN
Wallula, WA
Washoe Co, NV
Wayne Co, MI
Weirton, WV
West Pinal, AZ
Yakima Co, WA
Yuma, AZ