hundreds of pollution sensors, and forecast models to provide real-time air quality index (AQI) readings for more than 1,000 locations. Los Angeles’ air quality is closely tied to weather patterns.

As people return to the structures spared from Los Angeles wildfires, experts warn that they should be careful of the air inside and be especially cautious when cleaning up. Smoke, ash and all the ...

Air pollution is a well-known risk factor for respiratory diseases such as asthma and chronic obstructive pulmonary disease (COPD).

The smoke may be temporary, but toxic air pollution is an ever-present danger with effects that linger for generations.

Calculating air pollution from wildfires and other events has become more complicated. That doesn’t mean it’s necessarily more accurate.

Air pollution levels remained high in many parts of the city, including in northwest coastal Los Angeles, where the air quality index climbed to “dangerous” levels. Los Angeles, in particular ...

Data reviewed by Caltech scientists found spikes of lead, chlorine and bromine in the air after the Eaton fire started.

The American Lung Association’s State of the Air report for 2024 listed the Los Angeles area as one of the top 10 cities polluted by year-round particle pollution. It’s been No. 1 for ozone ...

On Sunday at 11:55 a.m. an updated air quality alert was issued in effect until Monday at noon. The alert is for San ...

The blazes that began on Jan. 7 charred thousands of buildings, cars and electronics across the Los Angeles area, creating ...