Will County, Illinois
AQI 45 · Good45
Median AQI
74
90th Percentile
156
Max AQI
273
Days with Data
Ranked #19 of 23 counties in Illinois (by median AQI, lower is better)
Monthly Median AQI — 2025
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45
Median AQI
74
90th Percentile
156
Max AQI
273
Days with Data
Ranked #19 of 23 counties in Illinois (by median AQI, lower is better)
Click a bar to view that month's details