Specialized air quality instruments captured a spike in lead, chlorine, and bromine pollution during the L.A. wildfires.

When he was president the first time, Trump denied California permission under the federal Clean Air Act to set pollution ...

an air pollution expert at the University of California, Los Angeles. "They don't have the spatial density or indeed ...

State officials have long considered the rules regulating diesel vehicles essential to cleaning up California’s severe air pollution and combating climate change. Tags ...

However, a major compounding factor was likely the downstream effects of two unusually wet winters the Southern California region saw in recent years. Other factors in the fires’ intensities ...

On Wednesday at 6:04 a.m. an air quality alert was issued valid until 7 p.m. The alert is for Eastern San Fernando Valley, Eastern San Gabriel Mountains, Eastern Santa Monica Mountains ...

California clean-air regulators withdrew requests with the Biden administration to set tougher pollution rules in the state for heavy-duty trucks, locomotives and ocean-going ships that were ...

California clean-air regulators withdrew requests with the Biden administration to set tougher pollution rules in the state for heavy-duty trucks, locomotives and ocean-going ships that were likely to ...

State officials have long considered the rules essential to cleaning up California’s severe air pollution and combating climate change. The withdrawal comes after the Biden administration ...

State officials have long considered the rules essential to cleaning up California’s severe air pollution and combating climate change. The withdrawal comes after the Biden administration recently ...