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Forbes: America's Dirtiest Cities

8 of 16

Fresno-Madera, CA

San Joaquin Valley air might be getting better; last August, for the first time in recorded history, Fresno had no days with unhealthy ozone levels.

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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