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Wednesday / June 29.
HomeTwitterAlthough it has seen incredible improvement since the 1970s, more than 4 in 10 Americans are still estimated to live in counties with poor air quality. So just how clean is the air we breathe in the U.S.?

Although it has seen incredible improvement since the 1970s, more than 4 in 10 Americans are still estimated to live in counties with poor air quality. So just how clean is the air we breathe in the U.S.?