Johnson County, Iowa
AQI 36 · Good36
Median AQI
62
90th Percentile
159
Max AQI
304
Days with Data
Ranked #1 of 15 counties in Iowa (by median AQI, lower is better)
Monthly Median AQI — 2025
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36
Median AQI
62
90th Percentile
159
Max AQI
304
Days with Data
Ranked #1 of 15 counties in Iowa (by median AQI, lower is better)
Click a bar to view that month's details