RANKABLE EPA COUNTY AQI
Frederick Air Quality - Maryland
EPA county-level evidence, NDS comparative intelligence, and 33 connected ZIP profiles.
Median AQI
41.0
Maximum AQI
93.0
Good-air-quality days
85.65%
Average PM2.5
N/A
NDS Air Quality Score
59.83
U.S. County Rank
408 of 1,049
Percentile
61.07
Grade
C
County status
Frederick 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.