RANKABLE EPA COUNTY AQI
Charleston Air Quality - South Carolina
EPA county-level evidence, NDS comparative intelligence, and 35 connected ZIP profiles.
Median AQI
47.0
Maximum AQI
105.0
Good-air-quality days
58.97%
Average PM2.5
7.864 ug/m3
NDS Air Quality Score
22.37
U.S. County Rank
930 of 1,049
Percentile
11.16
Grade
F
County status
Charleston 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.