The 25 Most Polluted Cities in the US

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Philadelphia-Camden-Wilmington, PA-NJ-DE-MD

  • High ozone days per year: 75
  • No. of days with unhealthy particle pollution: 3
  • People with asthma: 546,311
  • Population: 6,096,120

Another area that lies downwind of major sources of air pollution in the Midwest is the Philadelphia-Camden-Wilmington metro area. The area is also home to dozens of oil refineries and a busy interstate confluence.

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