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10 U.S. Cities With the Cleanest Air

Here are the 10 U.S. cities with the cleanest air, according to the American Lung Association’s annual report, which looks at levels of ozone and particulates (tiny particles that can get lodged in your lungs).

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Places you can breathe easy

By Lynne Peeples

Forty years after the Clean Air Act, more people are breathing easier. "In general, we’ve seen tremendous improvement in air quality," says Jonathan M. Samet, MD, director of the Institute for Global Health at the University of Southern California, in Los Angeles.

But some air is cleaner than others. Here are the 10 cities with the cleanest air, according to the American Lung Association’s annual report, which looks at levels of ozone and particulates, which are tiny particles that can get lodged in your lungs.

Next: Cheyenne, Wyo.