RANKABLE EPA COUNTY AQI

Clark Air Quality - Illinois

EPA county-level evidence, NDS comparative intelligence, and 13 connected ZIP profiles.

Median AQI

36.0

Maximum AQI

87.0

Good-air-quality days

92.13%

Average PM2.5

N/A

NDS Air Quality Score

73.05

U.S. County Rank

194 of 1,049

Percentile

81.49

Grade

County status

Clark is part of the governed NDS rankable EPA county universe.

EPA AQI evidence used here is county-derived. ZIP profiles connect to this evidence through the governed NDS geography relationship.