Three people monitored their air quality in different locations for several months. This is what we discovered.

Minneapolis was ranked among the cities with the cleanest air, while Seattle was praised for its investment in green spaces and sanitation in a new study.

A new report found that nearly half of Americans are "living in places that get failing grades" for air quality.

New map shows more than 500 facilities that emit toxic or hazardous air pollution and that could apply for Presidential ...

In the annual report, Sheboygan placed 24th worst out of 228 cities for ozone pollution. Milwaukee followed at 26th.

An interactive dashboard from the county of San Diego showing up-to-date information on environmental impacts of the Tijuana River sewage crisis is now live.