Billings County, North Dakota
AQI 40 · Good40
Median AQI
64
90th Percentile
195
Max AQI
243
Days with Data
Ranked #4 of 9 counties in North Dakota (by median AQI, lower is better)
Monthly Median AQI — 2025
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40
Median AQI
64
90th Percentile
195
Max AQI
243
Days with Data
Ranked #4 of 9 counties in North Dakota (by median AQI, lower is better)
Click a bar to view that month's details