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7. New Haven, Conn.

The 850,000 residents of the New Haven-Milford metro area may enjoy having a topflight school in Yale University, but due to their location at the intersection of I-95 and I-91, their lungs pay the price.

Sperling Air Quality Index: 6
Sperling Water Quality Index: 44

(AP Photo/Steven Senne)

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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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