RANKABLE EPA COUNTY AQI
Brown Air Quality - South Dakota
EPA county-level evidence, NDS comparative intelligence, and 20 connected ZIP profiles.
Median AQI
25.0
Maximum AQI
84.0
Good-air-quality days
87.08%
Average PM2.5
5.325 ug/m3
NDS Air Quality Score
74.19
U.S. County Rank
179 of 1,049
Percentile
82.92
Grade
B
County status
Brown 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.