Mercer County, North Dakota
AQI 39 · Good39
Median AQI
66
90th Percentile
283
Max AQI
243
Days with Data
Ranked #3 of 9 counties in North Dakota (by median AQI, lower is better)
Monthly Median AQI — 2025
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39
Median AQI
66
90th Percentile
283
Max AQI
243
Days with Data
Ranked #3 of 9 counties in North Dakota (by median AQI, lower is better)
Click a bar to view that month's details