America's most polluted cities

Published On: Nov 04 2011 11:51:22 AM PDT   Updated On: Apr 30 2014 11:00:00 PM PDT

Just how dirty is the air you breathe? The American Lung Association has released its latest list of the most polluted U.S. cities.

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2. Visalia-Porterville-Hanford, Calif.

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