Philly, NYC declared tops on 'most toxic city' list

Philly took first in toxicity.

Philadelphia, Pennsylvania and New York City, New York have been declared the No. 1 and No. 4 "most toxic" cities in the United States for 2011. The Greater Philadelphia Area is home to more than 50 federal Superfund sites.

Superfund areas are those that no longer in use but still contain hazardous materials. Researchers examined the country's 80 largest metropolitan statistical areas, as defined by the United States Census Bureau.

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