RANKABLE EPA COUNTY AQI
Charles Air Quality - Maryland
EPA county-level evidence, NDS comparative intelligence, and 26 connected ZIP profiles.
Median AQI
38.0
Maximum AQI
97.0
Good-air-quality days
92.37%
Average PM2.5
N/A
NDS Air Quality Score
70.13
U.S. County Rank
246 of 1,049
Percentile
76.53
Grade
B
County status
Charles 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.