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Air quality in Arkansas

EPA monitors report from 11 of Arkansas’s 75 counties. That is the honest limit of this page: the other 64 are not measured, not clean. In 2025 the most affected monitored county was Pulaski County, with 4 days above the moderate category.

11
Counties with monitors
64
Counties without
6
Days above moderate, 2025
Summed across monitored counties
10.3%
Adults with asthma
Population-weighted county estimate

County by county

Monitored Arkansas counties

GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
County90th %ile AQIAbove moderateMax AQI2025 days by category
Pulaski County694138
Crittenden County571112
Polk County591119
Arkansas County59077
Ashley County58079
Clark County46084
Garland County62092
Jackson County61088
Newton County50091
Union County62073
Washington County54074

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

64 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