A fleet of air quality monitoring vehicles took to the streets of California yesterday, marking the start of a year long ...

Thousands of people in southern California were advised to remain indoors as "emergency" air quality conditions hit parts of the Coachella Valley.

But air quality can vary on a hyperlocal scale, meaning the network of official sites is "fairly sparse," says Michael Jerrett, an air pollution expert at the University of California, Los Angeles.

Los Angeles Air Quality Index map Extreme fire behavior, including "short and long-range spotting," continues to challenge firefighting efforts, Cal Fire said in an incident update Wednesday. The ...

Mesquite, for instance, had an air quality index of 225 on Wednesday evening. That's considered "very unhealthy," according to AirNow , a government tool tracking air quality.

Air quality levels across large swathes of California have deteriorated as fires, such as the newly ignited Hughes Fire, continue to burn in and around Los Angeles. While air quality in Southern ...

More than 125 million people live in counties with F grades for ozone pollution, the lowest grade possible and reflective of a poor score that involves the Air Quality Index.

Air quality is a big concern for everyone in Southern California, even for those who don't live near fire zones. Here are answers to some of your top questions. 24/7 Live Los Angeles Orange County ...

KTLA’s Air Quality Map of Southern California shows wide swaths of the area have air quality that is unhealthy — meaning the air quality index is between 151 and 200 — with some areas listed ...

More than 125 million people live in counties with F grades for ozone pollution, the lowest grade possible and reflective of a poor score that involves the Air Quality Index.

Flames from the Hughes Fire burn trees in Castaic, California, on January 22, 2025. Ethan Swope/AP Photo What People Are Saying. The South Coast Air Quality Management District said in a post on X ...