PHILADELPHIA (WPVI) -- New data shows nearly half of Americans live in an area with a "failing grade" for air pollution, ...

WASHINGTON — Air quality in the D.C. metro area has gotten worse, the American Lung Association said. In this year's "State ...

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

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

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

"This year's report shows the dramatic impact that air pollution has on a growing number of people."ConnecticutIn Connecticut ...