Mercer County, Pennsylvania
AQI 41 · Good41
Median AQI
63
90th Percentile
115
Max AQI
243
Days with Data
Ranked #19 of 37 counties in Pennsylvania (by median AQI, lower is better)
Monthly Median AQI — 2025
Click a bar to view that month's details
41
Median AQI
63
90th Percentile
115
Max AQI
243
Days with Data
Ranked #19 of 37 counties in Pennsylvania (by median AQI, lower is better)
Click a bar to view that month's details