Randolph County, Illinois
AQI 44 · Good44
Median AQI
62
90th Percentile
161
Max AQI
272
Days with Data
Ranked #17 of 23 counties in Illinois (by median AQI, lower is better)
Monthly Median AQI — 2025
Click a bar to view that month's details
44
Median AQI
62
90th Percentile
161
Max AQI
272
Days with Data
Ranked #17 of 23 counties in Illinois (by median AQI, lower is better)
Click a bar to view that month's details