For 27 years, the American Lung Association has analyzed data from official air quality monitors to compile the "State of the Air" report. The more you learn about the air you breathe, the more you ...

The American Lung Association "State of the Air 2026" report ranks cities and grades counties based on their levels of ozone and two measures of particle pollution in 2022, 2023 and 2024. We use ...

Ozone is a chemical consisting of three oxygen atoms bonded in a V-like shape. It occurs both naturally through reactions in the atmosphere and as a pollutant released by transport and industrial ...

A hidden chemical leak may be quietly delaying the ozone layer’s comeback. The Montreal Protocol, signed in 1987, is widely considered one of the most effective environmental agreements ever ...

Each decade seems to have its signature environmental crisis that dominates headlines. Over time those issues seemingly disappear, leaving us to idly wonder from time to time if problems like the ...