RANKABLE EPA COUNTY AQI
Merrimack Air Quality - New Hampshire
EPA county-level evidence, NDS comparative intelligence, and 31 connected ZIP profiles.
Median AQI
38.0
Maximum AQI
90.0
Good-air-quality days
95.90%
Average PM2.5
N/A
NDS Air Quality Score
63.79
U.S. County Rank
344 of 1,049
Percentile
67.18
Grade
C
County status
Merrimack 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.