AUTOPLAY 

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 PhotoBruce Smith)

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)
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 NewsGetty Images)

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)
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 PhotoAlden Pellett)

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)
7 Brunswick, Georgia Located on the coast, Georgias 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 PhotoThe Brunswick News, James Nix)

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)
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 PhotoBrad Doherty)

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)
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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 PhotoJames MacPherson)

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)
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 PhotoMt. Bachelor, Inc.)

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.)
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 PhotoCourtesy Whatcom Land Trust)

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)
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 PhotoMichael C. York)

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)
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 PhotoDan Joling)

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)
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