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Data is current as of May 31, 2022

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 County, NV
Coachella Valley, CA
Columbia Falls, MT
Coso Junction, CA
Cuyahoga County, OH
Denver Metro, CO
Eagle River, AK
East Chicago, IN
East Kern County, CA
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 County, OH
Juneau, AK
Kalispell, MT
Kent, WA
King County, WA
Klamath Falls, OR
LaGrande, OR
Lake County, OR
Lamar, CO
Lane County (part); Oakridge, OR
Lane County; Eugene/Springfield, OR
Libby, MT
Los Angeles South Coast Air Basin, CA
Lyons Twsp., IL
Mammoth Lake, CA
Medford-Ashland, OR
Miami, AZ
Missoula, MT
Mohave County, AZ
Mono Basin, CA
Mun. of Guaynabo, PR
New Haven County, CT
New York County, NY
Nogales, AZ
Ogden, UT
Oglesby, IL
Olmsted County, MN
Olympia, Tumwater, Lacey, WA
Owens Valley, CA
Pagosa Springs, CO
Paul Spur/Douglas (Cochise County), AZ
Payson, AZ
Phoenix, AZ
Pierce County, WA
Pinehurst, ID
Portneuf Valley, ID
Presque Isle, ME
Ramsey County, MN
Rillito, AZ
Sacramento County, CA
Salt Lake County, UT
San Bernardino County, CA
San Joaquin Valley Air Basin, CA
Sanders County (part); Thompson Falls and vicinity, MT
Sheridan, WY
Shoshone County, ID
Southeast Chicago, IL
Spokane County, WA
Steamboat Springs, CO
Telluride, CO
Trona, CA
Utah County, UT
Vermillion County, IN
Wallula, WA
Washoe County, NV
Wayne County, MI
Weirton, WV
West Pinal, AZ
Yakima County, WA
Yuma, AZ