2023 Pa. air quality grades for particle pollution

The American Lung Association's 2023 State of the Air report grades counties on a weighted average of high particle pollution days from 2019-2021. Particle pollution is soot from things like power plants, fires or car exhaust. Exposure to high levels can be harmful and lead to health problems. Hover or tap on a county to see its grade, score and the most vulnerable populations compiled by the ALA report.