Researchers contributing to the ASCENT network of air quality sensors observed spikes in lead and chlorine downwind from the ...

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 ...

flame-fanning weather moved through Southern California. A Particularly Dangerous Situation red-flag warning expired in the afternoon, but dry conditions and gusty winds were forecast to linger ...

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 ...

Environmental groups express concern over the impact on public health and air quality in disadvantaged communities. State officials have long considered the rules regulating diesel vehicles essential ...

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 ...