Republican-run states contend in a lawsuit that the agency's deadlines for the plans are arbitrary and capricious.

California has decided to abandon its phase out of diesel trucks and requiring cleaner locomotives because of the incoming ...

A race against time. That’s how one air quality expert describes the current public health situation in Los Angeles, where ...

As people return to the structures spared from Los Angeles wildfires, experts warn that they should be careful of the air ...

Federal environmental regulators have proposed a new rule to slash carcinogenic air pollution from chemical plants prevalent ...

While Chevron’s new petrochemical furnace will lower its intensity of carbon emissions, it will also increase other harmful ...

An Environmental Protection Agency action expected Wednesday will unfreeze $150 million in paused Fairbanks-area road ...

For example, the first Trump administration tried to use the principles of transparency to prevent federal agencies from ...

Following power plant closures and EPA intervention, Detroit and Downriver are seeing lower levels of SO2 pollution. One ...

What’s different here is that the effects are showing up even at very modest levels of air pollution. The current EPA safety standard for 24-hour exposure to PM2.5 is 35 micrograms per cubic ...

The Air Quality Index (AQI) can tell you a lot about the health of the environment, but there are still measures you can take ...

The bay checkerspot butterfly, found in Santa Clara County, California near the San Francisco Bay as well as San Bruno Mountain and Edgewood County Park, was listed as threatened in September 1987 ...