With 7 of its ambitious rules for cars, trucks and trains repealed, California officials must find new ways to clean up the ...

California fights America's worst smog with the country's toughest environmental regulations. But is the Golden State really banning diesel trucks?

California is taking the Trump administration to court again, this time over the administration's blocking of the state's 2035 ban on the sale of new gas powered cars.

California's controversial rule requiring all new vehicles to be zero-emission by 2035 was overturned by the Senate Thursday, in a rebuke to the largest effort to phase out fossil fuels in US history.

California air regulators repealed a state rule Thursday that would have mandated rail operators phase out the diesel locomotives that traverse the state, but failed to get necessary federal approval.

California leaders said the state intends to challenge the move in court, and to find new ways to move drivers toward electric vehicles.

A group of 11 states led by California on Thursday filed suit challenging a repeal by Congress of the state's 2035 electric vehicle rules and heavy duty truck requirements.

He will also kill rules that phase out the sale of medium- and heavy-duty diesel vehicles and cut tailpipe emissions from trucks.

California passed another rule in 2020 to phase out the sale of medium- and heavy-duty diesel vehicles, including box trucks, semitrailers and large pickups.

Air quality regulators in Southern California are debating proposed rules that would curb harmful emissions from gas-powered furnaces and water heaters.

President Donald Trump signed a resolution on Thursday that blocks California’s first-in-the-nation rule banning the sale of new gas-powered cars by 2035. The state quickly announced that it ...

U.S. President Donald Trump on Thursday signed three resolutions approved by lawmakers barring California's electric vehicle sales mandates and diesel engine rules, including its landmark plan to ...