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Air quality in Nebraska

EPA monitors report from 11 of Nebraska’s 93 counties. That is the honest limit of this page: the other 82 are not measured, not clean. In 2025 the most affected monitored county was Knox County, with 4 days above the moderate category.

11
Counties with monitors
82
Counties without
11
Days above moderate, 2025
Summed across monitored counties
9%
Adults with asthma
Population-weighted county estimate

County by county

Monitored Nebraska counties

GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
County90th %ile AQIAbove moderateMax AQI2025 days by category
Knox County484115
Douglas County622137
Hall County542118
Gage County581131
Sarpy County561134
Washington County531132
Cass County36064
Lancaster County54087
Scotts Bluff County42064
Sioux County580100
Thomas County43087

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

82 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