"Both these types of pollution cause people to die. They shorten life expectancy and drive increases in asthma rates," says Mary Rice, a pulmonologist at Harvard University.

Through 2047, an administration regulatory impact analysis found this new standard will avoid 1.38 billion metric tons of carbon pollution -- the equivalent of 328 million gas-powered cars' annual ...

A layer of smog lingers above downtown Los Angeles in 2024. Millions of Americans are still breathing in unhealthy air, despite long-term progress toward cleaning up many sources of pollution ...