RANKABLE EPA COUNTY AQI
Humboldt Air Quality - California
EPA county-level evidence, NDS comparative intelligence, and 40 connected ZIP profiles.
Median AQI
36.0
Maximum AQI
75.0
Good-air-quality days
83.17%
Average PM2.5
6.303 ug/m3
NDS Air Quality Score
69.59
U.S. County Rank
252 of 1,049
Percentile
75.95
Grade
B
County status
Humboldt 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.