Several U.S. cities are experiencing heightened air pollution levels on Wednesday, including parts of Chicago.

Despite improvements in air quality in past decades, 156 million Americans still breathe in too much soot or ozone, says the ...

A new report on air quality across the U.S. offers a cloudy prognosis on the long-term health of about 156 million residents ...

A new report from the American Lung Association shows that Charleston has some of the best air quality in the U.S.

The air is cool, the high desert is nearly completely silent, and the Milky Way stretches like glitter across the sky ...