Delaware County, Ohio
AQI 41 · Good41
Median AQI
61
90th Percentile
119
Max AQI
211
Days with Data
Ranked #7 of 37 counties in Ohio (by median AQI, lower is better)
Monthly Median AQI — 2025
Click a bar to view that month's details
41
Median AQI
61
90th Percentile
119
Max AQI
211
Days with Data
Ranked #7 of 37 counties in Ohio (by median AQI, lower is better)
Click a bar to view that month's details