RANKABLE EPA COUNTY AQI
Harford Air Quality - Maryland
EPA county-level evidence, NDS comparative intelligence, and 19 connected ZIP profiles.
Median AQI
43.0
Maximum AQI
143.0
Good-air-quality days
74.59%
Average PM2.5
7.035 ug/m3
NDS Air Quality Score
42.69
U.S. County Rank
672 of 1,049
Percentile
35.78
Grade
D
County status
Harford 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.