America's most polluted cities

Published On: Nov 04 2011 02:51:22 PM EDT   Updated On: May 01 2014 02:00:00 AM EDT

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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6. Pittsburgh-New Castle-Weirton, Pa.-Ohio-W.Va.

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