RANKABLE EPA COUNTY AQI
Custer Air Quality - Idaho
EPA county-level evidence, NDS comparative intelligence, and 6 connected ZIP profiles.
Median AQI
3.0
Maximum AQI
13.0
Good-air-quality days
100.00%
Average PM2.5
N/A
NDS Air Quality Score
96.05
U.S. County Rank
3 of 1,049
Percentile
99.81
Grade
A+
County status
Custer 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.