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Why air pollution costs the U.S. $600 billion every year

Air pollution remains one of the key environmental issues in the United States. Although there have been sharp improvements since the 1970s, more than four in 10 Americans are estimated to live in counties with poor air quality. Air pollution kills more than 6 million people worldwide from heart attacks, strokes and diabetes every year. So just how clean is the air we breathe in the U.S.?

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