America's most polluted cities

POSTED: 11:51 AM PDT Nov 04, 2011    UPDATED: 11:00 PM PDT Apr 30, 2014 

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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20. (tie) Chicago-Naperville, Ill.-Ind.-Wis.

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