Flathead County, Montana
AQI 40 · Good40
Median AQI
59
90th Percentile
80
Max AQI
223
Days with Data
Ranked #20 of 23 counties in Montana (by median AQI, lower is better)
Monthly Median AQI — 2025
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40
Median AQI
59
90th Percentile
80
Max AQI
223
Days with Data
Ranked #20 of 23 counties in Montana (by median AQI, lower is better)
Click a bar to view that month's details