RANKABLE EPA COUNTY AQI
Union Air Quality - South Dakota
EPA county-level evidence, NDS comparative intelligence, and 3 connected ZIP profiles.
Median AQI
44.0
Maximum AQI
167.0
Good-air-quality days
65.57%
Average PM2.5
5.857 ug/m3
NDS Air Quality Score
28.60
U.S. County Rank
845 of 1,049
Percentile
19.27
Grade
F
County status
Union 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.