Conservation and public-health groups sued Environmental Protection Agency Administrator Lee Zeldin today for his failure to take action to reduce smog pollution in the Phoenix metro area and Mariposa ...

An curved arrow pointing right. Parts of South Asia are filled with toxic smog, hurting not only residents' health, but the economies of India and Pakistan. More from News Parts of South Asia are ...

The bad news on bad air seems to get worse by the day, but all is not as it seems over Western cities. We take a hard look at numbers Download the app ...