8. Philadelphia – Reading – Camden, PA-NJ-DE-MD
This area and its cities rank 8th on our list of cities with the worst air pollution in the US. They are not doing well since they moved from 16th to 11th position for particle-pollution. However, when it comes to the ozone pollution, there is a small improvement, since cities moved from 18th to 22nd place on the list which is great; however, more than 7.18 million citizens are still exposed to air of bad quality.
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