Eighty years ago, the enchantment ended. Los Angeles, that magical realm of shimmering natural beauty, was befouled by smog — maybe forever. The mayor, Fletcher Bowron, told Angelenos in 1944 to lower ...

The Los Angeles region has some of the most polluted air in the United States, failing to meet standards set by the Environmental Protection Agency for the last decade. Now, Caltech researchers have ...

As a child growing up in Southern California, Ann Carlson remembers mountains obscured by haze and yellowish brown air that stung her eyes and made her lungs ache. It was just “the environment,” her ...

As Delhi's air turns toxic once again, blanketed by winter smog that makes breathing difficult, the city faces a crisis that many major global metropolises have already overcome. Cities like London, ...