RANKABLE EPA COUNTY AQI
Howard Air Quality - Maryland
EPA county-level evidence, NDS comparative intelligence, and 19 connected ZIP profiles.
Median AQI
36.0
Maximum AQI
78.0
Good-air-quality days
77.01%
Average PM2.5
7.066 ug/m3
NDS Air Quality Score
65.93
U.S. County Rank
314 of 1,049
Percentile
70.04
Grade
B
County status
Howard 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.