Clay County, South Dakota
AQI 37 · Good37
Median AQI
57
90th Percentile
74
Max AQI
167
Days with Data
Ranked #6 of 10 counties in South Dakota (by median AQI, lower is better)
Monthly Median AQI — 2025
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37
Median AQI
57
90th Percentile
74
Max AQI
167
Days with Data
Ranked #6 of 10 counties in South Dakota (by median AQI, lower is better)
Click a bar to view that month's details