Cities in California make up a significant proportion of the country's most polluted metropolitan areas when it comes to air ...

Every year, air pollution causes an estimated 6.7 million premature deaths, according to the World Health Organization.

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

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

Air pollution levels keep getting worse for more people in the US, according to a new report, and experts say the Trump ...

“State of the Air” uses letter grades to measure unhealthy levels of ground-level ozone air pollution (also known as smog), ...

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

Man-made air pollution is decreasing, but overall air pollution is worse due in part of wildfire smoke, according to a new ...