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Air quality in Oklahoma

EPA monitors report from 24 of Oklahoma’s 77 counties. That is the honest limit of this page: the other 53 are not measured, not clean. In 2025 the most affected monitored county was Love County, with 7 days above the moderate category.

24
Counties with monitors
53
Counties without
55
Days above moderate, 2025
Summed across monitored counties
11.5%
Adults with asthma
Population-weighted county estimate

County by county

Monitored Oklahoma counties

GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
County90th %ile AQIAbove moderateMax AQI2025 days by category
Love County807169
Oklahoma County717459
Comanche County674131
Nowata County744140
Cleveland County653130
Jefferson County613108
Johnston County713119
Pittsburg County643140
Adair County652184
Canadian County612115
Kay County572141
Osage County612105
Ottawa County662305
Sequoyah County572138
Tulsa County742508
Washington County612168
Carter County551155
Dewey County711164
Grant County531105
McClain County671126
Pontotoc County631101
Creek County61097
Kiowa County61097
Mayes County49087

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

53 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