The LA area is once again the worst for ozone in the U.S., a pollutant impacting millions more people nationwide, the ...

An annual report from the American Lung Assn. showed that Los Angeles has improved its air quality but still deserves its ...

Several U.S. cities are experiencing heightened air pollution levels on Wednesday, including parts of Chicago.

UCLA's annual survey reveals growing concerns over the high cost of living and deportation fears among LA County residents.

and other environmental health hazards and shared them with the public through the local Air Quality Index. 04:18 It’s winter in California, so why is Los Angeles County on fire? It’s winter ...