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

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 ...

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

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.

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

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 ...

There are 25 million more people living with bad air than last year's report showed, according to air quality data from the ...

How Southern California Wildfires Impact Air Quality, Smoke Damage, and Insurance Coverage - The Southern California ...

Reno and other Nevada cities ranked worse than Los Angeles for air pollution, according to the American Lung Association’s ...