RANKABLE EPA COUNTY AQI
Madison Air Quality - Illinois
EPA county-level evidence, NDS comparative intelligence, and 26 connected ZIP profiles.
Median AQI
48.0
Maximum AQI
260.0
Good-air-quality days
55.26%
Average PM2.5
9.032 ug/m3
NDS Air Quality Score
19.17
U.S. County Rank
957 of 1,049
Percentile
8.59
Grade
F
County status
Madison is part of the governed NDS rankable EPA county universe.
Connected ZIP codes
Methodology
EPA AQI evidence used here is county-derived. ZIP profiles connect to this evidence through the governed NDS geography relationship.