Delaware County, Pennsylvania
AQI 44 · Good44
Median AQI
66
90th Percentile
153
Max AQI
212
Days with Data
Ranked #31 of 37 counties in Pennsylvania (by median AQI, lower is better)
Monthly Median AQI — 2025
Click a bar to view that month's details
44
Median AQI
66
90th Percentile
153
Max AQI
212
Days with Data
Ranked #31 of 37 counties in Pennsylvania (by median AQI, lower is better)
Click a bar to view that month's details