RANKABLE EPA COUNTY AQI
McHenry Air Quality - Illinois
EPA county-level evidence, NDS comparative intelligence, and 10 connected ZIP profiles.
Median AQI
43.0
Maximum AQI
165.0
Good-air-quality days
66.18%
Average PM2.5
8.936 ug/m3
NDS Air Quality Score
27.39
U.S. County Rank
862 of 1,049
Percentile
17.65
Grade
F
County status
McHenry 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.