RANKABLE EPA COUNTY AQI
Napa Air Quality - California
EPA county-level evidence, NDS comparative intelligence, and 15 connected ZIP profiles.
Median AQI
41.0
Maximum AQI
77.0
Good-air-quality days
77.14%
Average PM2.5
5.920 ug/m3
NDS Air Quality Score
60.40
U.S. County Rank
394 of 1,049
Percentile
62.40
Grade
C
County status
Napa is part of the governed NDS rankable EPA county universe.
Methodology
EPA AQI evidence used here is county-derived. ZIP profiles connect to this evidence through the governed NDS geography relationship.