America's most polluted cities

POSTED: 11:51 AM PDT Nov 04, 2011    UPDATED: 11:00 PM PDT Sep 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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David McNew/Getty Images

Just how dirty is the air you breathe? The American Lung Association's annual report of the most polluted cities in the U.S. rates communities on levels of ozone, sulfur dioxide, air-borne particulates and tainted tap water. Here are the 20 cities most polluted by year-round particle pollution:

 
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