National Data System · Environmental Intelligence · EPA Air Quality
National Data System Air Quality Intelligence
RANKABLE EPA COUNTY AQI

Cook Air Quality - Illinois

EPA county-level evidence, NDS comparative intelligence, and 228 connected ZIP profiles.

Compare this County
Median AQI
53.0
Maximum AQI
168.0
Good-air-quality days
40.51%
Average PM2.5
9.923 ug/m3
NDS Air Quality Score
14.73
U.S. County Rank
995 of 1,049
Percentile
4.96
Grade
F

County status

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

Methodology

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