RANKABLE EPA COUNTY AQI
Johnston Air Quality - North Carolina
EPA county-level evidence, NDS comparative intelligence, and 16 connected ZIP profiles.
Median AQI
42.0
Maximum AQI
84.0
Good-air-quality days
76.56%
Average PM2.5
7.003 ug/m3
NDS Air Quality Score
51.71
U.S. County Rank
546 of 1,049
Percentile
47.81
Grade
C
County status
Johnston 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.