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Air quality in Mississippi

EPA monitors report from 10 of Mississippi’s 82 counties. That is the honest limit of this page: the other 72 are not measured, not clean. In 2025 the most affected monitored county was DeSoto County, with 1 days above the moderate category.

10
Counties with monitors
72
Counties without
1
Days above moderate, 2025
Summed across monitored counties
10%
Adults with asthma
Population-weighted county estimate

County by county

Monitored Mississippi counties

GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
County90th %ile AQIAbove moderateMax AQI2025 days by category
DeSoto County611143
Bolivar County58088
Forrest County59097
Hancock County58084
Harrison County62097
Hinds County63084
Jackson County59093
Lauderdale County48093
Lee County48064
Yalobusha County45080

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

72 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