The American Lung Association report finds that climate events are causing more people in the U.S. to breathe toxic air even ...

The iconic skyline of downtown Los Angeles has been clouded by smog for decades, so this title should come as no surprise to Angelenos. Yet again, L.A. is the smoggiest city in the U.S., according ...

Visalia is once again the worst for ozone in the U.S., a pollutant impacting millions more people nationwide, the American Lung Association said.