Earth's atmosphere is divided into several distinct layers, each characterized by specific temperature variations, composition, and phenomena. Below are the primary layers of the atmosphere, from the ...

The Portland metro area lands in the middle of the pack for ozone pollution, according to a new report from the American Lung ...

Nearly half of Americans in the U.S. live in areas with failing air quality, according to the American Lung Association’s ...

Arizona’s air is getting cleaner—but not clean enough. A new report from the American Lung Association shows some wins for ...