RANKABLE EPA COUNTY AQI
Snohomish Air Quality - Washington
EPA county-level evidence, NDS comparative intelligence, and 30 connected ZIP profiles.
Median AQI
41.0
Maximum AQI
87.0
Good-air-quality days
69.14%
Average PM2.5
6.484 ug/m3
NDS Air Quality Score
42.78
U.S. County Rank
670 of 1,049
Percentile
35.97
Grade
D
County status
Snohomish 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.