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8. San Jose, Calif

You don't equate Silicon Valley with pollution, but the San Jose-Sunnyvale-Santa Clara metro area is home to more than a dozen Superfund sites where chipmakers like Fairchild and Intel leaked toxic solvents into the earth. Ozone pollution is also a problem.

Sperling Air Quality Index: 13
Sperling Water Quality Index: 30

(Terry Wilson/istockphoto)

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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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