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6. Riverside, Calif.

The 4.2 million residents of the Riverside-San Bernardino metro area suffer from high levels of ozone. In 2009 the EPA placed on the Superfund list a site the for decades manufactured explosives, rocket motors and fireworks, and which leaked perchlorate and trichloroethylene, destroying drinking water supplies.

Sperling Air Quality Index: 1
Sperling Water Quality Index: 49

(David McNew/Getty Images)

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

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