At 7:50 a.m. on Thursday, the NWS Phoenix AZ reported an air quality alert in effect until Saturday at midnight. The alert is for Imperial County Southwest, Imperial County West and Imperial Valley.

Switching from diesel to electric trains dramatically improved the air quality aboard the San Francisco Bay Area's Caltrain commuter rail line, reducing riders' exposure to the carcinogen black carbon ...

The red-level air quality index (AQI) category—covering values from 151 to 200—means the air is unhealthy for everyone, not ...

A new law tightens building and emissions regulations for large distribution warehouses to mitigate air pollution and traffic in surrounding communities.

The NWS San Diego CA reported an air quality alert at 11:08 a.m. on Wednesday in effect until Thursday at 8 p.m. for ...

A health alert has been issued for the Coachella Valley due to dangerous dust pollution just before the music festival's second weekend.

The Los Angeles County Department of Public Health has launched an interactive online dashboard that provides the public with ...

A new study shows the switch resulted in a dramatic drop in toxic air pollutants on board trains and around major transit ...

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Witkoff says US ‘finally’ got answer on Putin’s demands for peace.