According to Oregon and California’s fire departments, trucks were stopped in Davis, California, just outside Sacramento, for maintenance and safety checks, and those trucks continued onward. Photos ...

Since 1997, nitrogen oxides have decreased 70% in the air basin ... plan to achieve federal smog standards. This story originally appeared in Los Angeles Times.

Also, something in the Los Angeles smog was destroying rubber tires and damaging crops ... Although we have made great progress during the past 70 years at reducing pollutants in the air, ground-level ...

Santa Ana winds will hit the Los Angeles area yet again this week, bringing extreme risk of rapid fire spread as the region continues to tamp out deadly wildfires that ignited under similar conditions ...

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 ...

Los Angeles is a trap. Everyone who lives there knows it. The basin formed by the ring of mountains around the city traps smog, preventing it from dissipating safely into the inland desert.

More than 70 firefighters from Mexico were welcomed by Gov. Gavin Newsom at Los Angeles International Airport on Saturday, offering aid in the county's fight against some the state's worst fires ...

If you're not in Los Angeles for Hollywood, you're probably here for the beach. With over 70 miles of shoreline ... of the city thanks to fewer bouts of smog and a more laid-back atmosphere ...

The best times to visit Los Angeles are from March to May and between ... the heat coupled with heavy smog levels often drive visitors and residents alike to the already crowded oceanside ...

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 ...