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Air quality in Kansas

EPA monitors report from 12 of Kansas’s 105 counties. That is the honest limit of this page: the other 93 are not measured, not clean. In 2025 the most affected monitored county was Shawnee County, with 5 days above the moderate category.

12
Counties with monitors
93
Counties without
24
Days above moderate, 2025
Summed across monitored counties
9.9%
Adults with asthma
Population-weighted county estimate

County by county

Monitored Kansas counties

GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
County90th %ile AQIAbove moderateMax AQI2025 days by category
Shawnee County615238
Wyandotte County665240
Sumner County614370
Johnson County603188
Neosho County623315
Douglas County491101
Ford County511115
Sedgwick County631192
Trego County611116
Chase County54095
Leavenworth County48097
Sherman County49093

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

93 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