Gallatin County, Montana

AQI 14 · Good

YearMonth

14

Median AQI

25

90th Percentile

62

Max AQI

226

Days with Data

Ranked #9 of 23 counties in Montana (by median AQI, lower is better)

Monthly Median AQI — 2025

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AQI Category Breakdown

Adjacent Counties

Fremont County, Idaho Broadwater County Jefferson County Madison County Meagher County Park County Park County, Wyoming Teton County, Wyoming

External Links

Gallatin County, Montana on Wikipedia