RANKABLE EPA COUNTY AQI
Frederick Air Quality - Virginia
EPA county-level evidence, NDS comparative intelligence, and 11 connected ZIP profiles.
Median AQI
42.0
Maximum AQI
85.0
Good-air-quality days
70.42%
Average PM2.5
7.596 ug/m3
NDS Air Quality Score
42.29
U.S. County Rank
674 of 1,049
Percentile
35.59
Grade
D
County status
Frederick 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.