Most polluted cities in the United States

This will make you take a deep breath: The American Lung Association, each year, ranks regions around the USA for short-term particulates, long-term particulates, and ozone levels. Combining the three categories of pollution into one table allows a relative ranking of the five most polluted places to live. All of the top five are in California and four out of five are located in the southern half of the San Joaquin Valley.

American Lung Association data
Table of five worst cities as pdf