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Air quality in North Dakota

EPA monitors report from 9 of North Dakota’s 53 counties. That is the honest limit of this page: the other 44 are not measured, not clean. In 2025 the most affected monitored county was Burke County, with 13 days above the moderate category.

9
Counties with monitors
44
Counties without
92
Days above moderate, 2025
Summed across monitored counties
10.1%
Adults with asthma
Population-weighted county estimate

County by county

Monitored North Dakota counties

GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
County90th %ile AQIAbove moderateMax AQI2025 days by category
Burke County6713285
Burleigh County6012218
Ward County6012283
Cass County7111192
Oliver County5811242
Mercer County5910283
Dunn County619217
Billings County608195
McKenzie County616197

EPA Air Quality System annual summaries by county, 2025. The 90th percentile AQI describes a day worse than nine out of ten, which is a steadier measure than the annual maximum a single wildfire can set.

Not measured

44 counties without a monitor

No EPA monitor reported from these counties, so there is no air quality record to publish. Their radon zone is known, and radon is measured in the building rather than the air outside it.

Other states

Air quality elsewhere