A hidden air pollutant is discovered by Caltech scientists that may change the way smog is studied in Southern California ...

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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 ...

The Los Angeles metro is once again the worst ... the lowest grade possible and reflective of a poor score that involves the Air Quality Index. “The severity of the problem and the abruptness ...

The iconic skyline of downtown Los Angeles has ... 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 ...

Despite decades of progress in reducing air pollution, Los Angeles is still the nation ... many experts worry could negatively effect air quality, reversing decades of progress in California.

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 Air Quality Index, which ranges from 0 to 500 ... Chicago area 15th worst in the nation for ozone pollution, with Los Angeles at No. 1. Not everyone was reporting the dangerous air quality ...