With more than a million acres of protected open space, plus a general reputation as a "green" region with ambitious emission ...

Pollution levels in certain parts of the US are soaring to dangerous levels with vulnerable people being advised to avoid ...

PITTSBURGH — The greater Pittsburgh metropolitan area is among the 25 regions in the country with the worst air pollution, ...

Over half of U.S. counties lack air quality monitoring stations, exposing 50.7 million people, especially in rural and ...