The 10 Cleanest U.S. Cities

Swan Return

10 Cleanest Cities in the U.S.
10: Charleston, South Carolina

This historic Southern city is one of the cleanest in the country when it comes to ozone. Population: 697,439; number of children with asthma: 13,977; number of adults with asthma: 46,862.
(AP Photo/Bruce Smith)

AP Photo/Bruce Smith

10 Cleanest Cities in the U.S.
9: Cape Coral-Fort Meyers-Naples, Florida

These Gulf-side Florida towns have low ozone levels, according to the American Lung Association. Population: 977,720; number of children with asthma: 16,412; number of adults with asthma: 64,330.
(Getty Images News/Getty Images)

Getty Images News/Getty Images

10 Cleanest Cities in the U.S.
8: Burlington-South Burlington, Vermont

The air is clear in Burlington, which ranks as one of the cleanest cities in the U.S. Population: 213,701; children with asthma: 3,416; adults with asthma: 19,097.
(AP Photo/Alden Pellett)

AP Photo/Alden Pellett

10 Cleanest Cities in the U.S.
7: Brunswick, Georgia

Located on the coast, Georgia's town of Brunswick remains one of the cleanest. Population: 113,448; number of children with asthma: 2,879; number of adults with asthma: 7,159.
(AP Photo/The Brunswick News, James Nix)

AP Photo/The Brunswick News, James Nix

10 Cleanest Cities in the U.S.
6: Brownsville-Harlingen-Raymondville, Texas

Located just above the U.S./Mexico border is Brownsville, one of the cleanest cities in the U.S. Population: 437,615; number of children with asthma: 10,916; number of adults with asthma: 20,277.
(AP Photo/Brad Doherty)

AP Photo/Brad Doherty

10 Cleanest Cities in the U.S.
5: Bismark, North Dakota

Bismark sits smack-dab in the middle of North Dakota, and it has some of the cleanest air in the country. Population: 120,060; number of children with asthma: 1,801; number of adults with asthma: 6,981.
(AP Photo/James MacPherson)

AP Photo/James MacPherson

10 Cleanest Cities in the U.S.
4: Bend-Redmond-Prineville, Oregon

The air is clean and so is the powder in Bend, Oregon. Population: 183,006; number of children with asthma: 2,965; number of adults with asthma: 15,061.
(AP Photo/Mt. Bachelor, Inc.)

AP Photo/Mt. Bachelor, Inc.

10 Cleanest Cities in the U.S.
3: Bellingham, Washington

North of Seattle and just south of Vancouver is Bellingham, one of the cleanest cities in the U.S. Population: 205,262; number of children with asthma: 2,780; number of adults with asthma: 15,850.
(AP Photo/Courtesy Whatcom Land Trust)

AP Photo/Courtesy Whatcom Land Trust

10 Cleanest Cities in the U.S.
2: Bangor, Maine

This Maine city is both scenic and clean when it comes to ozone. Population: 153,746; number of children with asthma: 2,826; number of adults with asthma: 13,883.
(AP Photo/Michael C. York)

AP Photo/Michael C. York

10 Cleanest Cities in the U.S.
1: Anchorage, Alaska

Anchorage ranks high for its low ozone levels and also for its low 24-hour particle pollution and its annual particle pollution. Population: 392,535; number of children with asthma: 8,881; number of adults with asthma: 26,240.
(AP Photo/Dan Joling)

AP Photo/Dan Joling