Biden administration partially restores air pollution standards weakened by Trump

The Biden administration has tightened standards for polluters that were rolled back under the Trump administration — but did not fully return them to their pre-Trump strength.

The policy in question concerns facilities that were once considered “major” emitters of hazardous pollution but have since taken steps to reduce their emissions. 

Prior to the Trump administration, facilities that had at one point been considered “major” pollution sources would still have to meet stringent...