Hill County, Montana
AQI 13 · Good13
Median AQI
34
90th Percentile
157
Max AQI
149
Days with Data
Ranked #6 of 23 counties in Montana (by median AQI, lower is better)
Monthly Median AQI — 2025
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13
Median AQI
34
90th Percentile
157
Max AQI
149
Days with Data
Ranked #6 of 23 counties in Montana (by median AQI, lower is better)
Click a bar to view that month's details