It was established by the Environmental Protection Agency ... are used on air quality forecast maps. No city had a worse sustained reading in 2021 than Salem, Ore., where the index almost reached ...

Dozens of Haskell Indian Nations University community members joined EPA officials on Wednesday at a ribbon-cutting for a ...

The EPA measures regional air quality index (AQI) by how hazardous it is to the general public. Discover the AQI in your city by searching below.

This measure, based on data from the Environmental Protection Agency, evaluates states on the number of days the Air Quality Index in counties was not rated “good.” U.S. News calculated a ...

The American Lung Association said they hope the report helps convince Illinois lawmakers to take action to improve air ...