The Los Angeles region has some of the most polluted air in the United States, failing to meet standards set by the Environmental Protection Agency for the last decade. Now, Caltech researchers have ...

Traffic heads north on the 405 Freeway on Oct. 1, 2025, as a new era in commuting begins for clean-air vehicles with new rules and uncertainty over how they will affect commute times and traffic.

Picture it: July 8, 1943, Los Angeles, California. You go outside and are inundated by a mysterious brown haze in the air that smells gaseous. This is unprecedented, and nobody knows what could be ...

Add Yahoo as a preferred source to see more of our stories on Google. Marian E. Lent walks to work on the morning of Feb. 4, 1953, as City Hall is seen through the smog in downtown Los Angeles. (R.L.

A hidden pollutant that contaminates Southern California’s nighttime air is much more prevalent than previously thought, suggesting that air quality alerts underestimate the health effects of ...

The Los Angeles-Long Beach is the nation’s smoggiest region, according to a report released Wednesday by the American Lung Association. The study released Wednesday also documented the region’s ...

Temperatures are on the rise and the inversion layer's returning to Southern California. All that exhaust from all those cars is staying with us. Does Los Angeles' experience with smog contains ...

Centered in Los Angeles… ANN CARLSON, LEGAL SCHOLAR: There was a plant that manufactured a chemical called butadiene which was used in making rubber for the war effort. MUSTAFA SANTIAGO ALI, ...