San Juan County, Colorado
AQI 4 · Good4
Median AQI
9
90th Percentile
13
Max AQI
20
Days with Data
Ranked #2 of 27 counties in Colorado (by median AQI, lower is better)
Monthly Median AQI — 2025
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4
Median AQI
9
90th Percentile
13
Max AQI
20
Days with Data
Ranked #2 of 27 counties in Colorado (by median AQI, lower is better)
Click a bar to view that month's details