The Most Polluted Cities in the United States in 2012

For the past 13 years the American Lung Association releases a new State of the Air Report annually sharing their test results of air pollution across the United States.

air pollution by Alex Abian (Flickr)
This year, they have been joined by InfoNewt to release an infographic designs based on the 2012 report.
You can find the list of the Most Polluted Cities in the United States 2012: