Custer County, South Dakota
AQI 46 · Good46
Median AQI
61
90th Percentile
87
Max AQI
181
Days with Data
Ranked #9 of 10 counties in South Dakota (by median AQI, lower is better)
Monthly Median AQI — 2025
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46
Median AQI
61
90th Percentile
87
Max AQI
181
Days with Data
Ranked #9 of 10 counties in South Dakota (by median AQI, lower is better)
Click a bar to view that month's details