Forty-seven percent of Americans live in counties with potentially dangerous levels of air pollution, according to the American Lung Associations 15th annual State of the Air report, a worrisome finding as climate change threatens to make air quality worse. The two main pollutants measured were ozone, also known as smog, and particle pollution, the kind that comes out of exhaust pipes. Particle pollution can increase the risk of heart disease, lung cancer, and asthma. The pollution data compiled in the report was taken from the Environmental Protection Agency (EPA).
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