RANKABLE EPA COUNTY AQI
Washington Air Quality - Oregon
EPA county-level evidence, NDS comparative intelligence, and 22 connected ZIP profiles.
Median AQI
36.0
Maximum AQI
88.0
Good-air-quality days
84.62%
Average PM2.5
5.010 ug/m3
NDS Air Quality Score
67.78
U.S. County Rank
278 of 1,049
Percentile
73.47
Grade
B
County status
Washington 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.