RANKABLE EPA COUNTY AQI
Clay Air Quality - South Dakota
EPA county-level evidence, NDS comparative intelligence, and 8 connected ZIP profiles.
Median AQI
37.0
Maximum AQI
74.0
Good-air-quality days
82.63%
Average PM2.5
5.717 ug/m3
NDS Air Quality Score
66.77
U.S. County Rank
300 of 1,049
Percentile
71.37
Grade
B
County status
Clay 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.