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 air agency doesn’t plan to monitor the air or take any immediate steps to protect schools and households from the gas, ...

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

“State of the Air” uses letter grades to measure unhealthy levels of ground-level ozone air pollution (also known as smog), ...

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 ...