RANKABLE EPA COUNTY AQI
Clark Air Quality - Washington
EPA county-level evidence, NDS comparative intelligence, and 24 connected ZIP profiles.
Median AQI
31.0
Maximum AQI
80.0
Good-air-quality days
89.30%
Average PM2.5
4.478 ug/m3
NDS Air Quality Score
77.02
U.S. County Rank
146 of 1,049
Percentile
86.16
Grade
A
County status
Clark 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.