Bakersfield is the oil capital of California, home to some of the oldest and biggest fields in the nation. Emissions from oil and gas processing contribute to Central Valley air pollution that is the worst in the nation. According to the Lung Association, the population of 800,000 is subject to the worst particle pollution in the country and third-worst ozone. Sperling Air Quality Index:
1 Sperling Water Quality Index:
(Casey Christie/ZUMA Press/Newscom) More from Forbes
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