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What city in the United States has the worst air pollution?

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This central Pennsylvania region has seen its air pollution worsen dramatically in recent years. In 2014, it ranked 33rd for year-round fine particle pollution; in 2015, 12th; and now, ninth. Harrisburg is an area with a lot of commuters. read more

(MORE: 2014's Worst Spring Allergy Cities) Ozone — a molecule made up of three oxygen atoms — is the dominant form of air pollution in the United States. The molecule has been linked to premature death, asthma, wheezing, coughing, shortness of breath, susceptibility to infections and lung-tissue swelling. read more

The Iranian city of Zabol, which battles some 80 dust storms per year, was found to have the worst air pollution of any city on the planet. Coming in at 1,080 on the list was Visalia, California, the most polluted city in the United States. read more

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