Washington County, Pennsylvania

AQI 42 · Good

YearMonth

42

Median AQI

60

90th Percentile

100

Max AQI

212

Days with Data

Ranked #25 of 37 counties in Pennsylvania (by median AQI, lower is better)

Monthly Median AQI — 2025

Click a bar to view that month's details

AQI Category Breakdown

Adjacent Counties

Allegheny County Beaver County Fayette County Greene County Westmoreland County Brooke County, West Virginia Hancock County, West Virginia Marshall County, West Virginia Ohio County, West Virginia

External Links

Washington County, Pennsylvania on Wikipedia