America's 20 Dirtiest Cities

Pollution-wise, that is.  Forbes ranks them.  Most of the worst are in California.  Knoxville, however, is 15th.

America's 20 Dirtiest Cities
15. Knoxville-Sevierville-La Follette, TN
Population: 1 million
Year-round particulate pollution rank: 24
Short-term particulate pollution rank: 33
Ozone pollution rank: 18


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