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

Despite improvements in air quality in past decades, 156 million Americans still breathe in too much soot or ozone, says the ...

Five parts of California, including County, were listed among the top 10 smoggiest in the U.S. by the American Lung ...

Cities in California make up a significant proportion of the country's most polluted metropolitan areas when it comes to air ...

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