The sky over L.A. has previously contained signs, and people had the good sense to heed them. Before water from the Owens Valley was brought to L.A., and Hollywood studios began to line its boulevards ...

It would take years for scientists to piece together the puzzle of this Los Angeles smog and decades to implement policies to improve the air we all breathe. Today, scientists are able to monitor the ...

In a pointed response, local air officials claimed the EPA was responsible for the damaging health effects of Los Angeles area smog, because it has failed to offer solutions to curb emissions from ...

Environmental and public-health groups filed a lawsuit today against the Environmental Protection Agency for failing to ensure that Los Angeles, Sacramento and New Hampshire have effective plans to ...

Photos and news coverage confirm that trucks from other states were assisting firefighters in Los Angeles. As wildfires ... because they didn't meet California's smog-certification requirements.