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Forbes: America's Dirtiest Cities

11 of 16

3. Visalia-Porterville, CA

Population: 430,000
Year-round particulate pollution rank: 2
Short-term particulate pollution rank: 7
Ozone pollution rank: 3

More From Forbes:
America’s Most Dangerous Cities
America’s Dirtiest Hotels
The Most Beautiful College Campuses

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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