5 Cleanest U.S. Cities for Pollution*

Two cities in Texas made the list.

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1. Alexandria, La.

2. Amarillo, Texas

3. Bismarck, N.D.

4. Brownsville-Harlingen-Raymondville, Texas

5. Cheyenne, Wyo.

*By short-term particle pollution

Source: American Lung Association, State of the Air 2008