An annual report from the American Lung Assn. showed that Los Angeles has improved its air quality but still deserves its reputation for unhealthy air.

The Los Angeles region has some of the most polluted air in the United States, failing to meet standards set by the ...

Produced primarily by the burning of fossil fuels, ammonium nitrate is a substantial portion of particulate pollution, a ...

California has used federal waivers to help clean up its air quality for decades. The U.S. Senate will likely revoke that ...

Los Angeles has long struggled with air pollution, and despite progress over the decades, smog is still a major issue in the ...

To the editor: Southern California has the smoggiest air in the country (“Los Angeles remains nation ... The South Coast Air Quality Management District can lead by passing rules to transition ...

The iconic skyline of downtown Los Angeles ... The “State of the Air” report from the association has been handing out grades to American cities based on their air quality for the past 26 ...

At 8:26 a.m. on Friday, the NWS Phoenix AZ reported an air quality alert in effect until Sunday at noon. The alert is for ...

A South Coast Air Quality Management District expert offered tips on how to stay safe during summer smog season as hot weather has an adverse affect on air quality.

The Los Angeles police have released body camera video showing the moment officers shot the wife of the band Weezer's bass player, Jillian Shriner. Authorities are investigating a jewelry heist in ...

Just up the road, San Francisco is undergoing a civic revival. New leadership has embraced pragmatic policies, tough love, and a renewed sense of civic pride. Encampments and open-air drug markets are ...