RANKABLE EPA COUNTY AQI
Custer Air Quality - South Dakota
EPA county-level evidence, NDS comparative intelligence, and 8 connected ZIP profiles.
Median AQI
46.0
Maximum AQI
87.0
Good-air-quality days
72.38%
Average PM2.5
7.378 ug/m3
NDS Air Quality Score
31.28
U.S. County Rank
809 of 1,049
Percentile
22.71
Grade
D
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.