17. Philadelphia-Reading-Camden, PA-NJ-DE-MD
Twenty-second on our list of most polluted cities in the US in 2017 is Philadelphia. Besides the ozone ranking, it is 20th for 24-hour particle pollution out of 186 metropolitan areas and on 11th place for annual particle pollution out of 184 metropolitan areas. Out of more than 7 million people, 4,604 are dealing with lung cancer.
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