Teams of experts at Air Quality keep a network of statewide air monitors running smoothly year-round, which helps inform the ...

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 ...

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.

The Clean Air Act requires the U.S. Environmental Protection Agency to create and enforce air-quality standards for the sake of the ... Smog mainly comes from the extraction, processing, ...

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 ...