The air agency doesn’t plan to monitor the air or take any immediate steps to protect schools and households from the gas, ...

It looks at data from air quality monitors to tell which cities are the cleanest and most polluted for ozone and short-term ...

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 ...

An air quality alert is in place for parts of Southern California on Thursday as windblown dust creates hazardous conditions.

LOS ANGELES (CNS) -- The Los Angeles-Long Beach area ranked as the nation's smoggiest region in a report released Wednesday ...