RANKABLE EPA COUNTY AQI
Air Quality in ZIP 99403 - Clarkston, Washington
County-derived EPA air-quality evidence connected locally through National Data System.
Median AQI
35.0
Maximum AQI
151.0
Good-air-quality days
73.75%
Average PM2.5
N/A
NDS Air Quality Score
49.42
U.S. County Rank
576 of 1,049
Percentile
44.94
Grade
C
What the data means
ZIP 99403 is connected to governed EPA county-level air-quality evidence for Asotin.
ZIP ranking note: ZIPs are not separately ranked. The rank shown on this page is the associated county rank because the EPA AQI evidence used here is county-derived.
County context
Methodology
EPA AQI evidence is county-derived. NDS connects that evidence to ZIP geography where a governed county relationship exists. NDS does not claim that EPA directly ranks ZIP codes.