RANKABLE EPA COUNTY AQI
San Francisco Air Quality - California
EPA county-level evidence, NDS comparative intelligence, and 38 connected ZIP profiles.
Median AQI
33.0
Maximum AQI
94.0
Good-air-quality days
76.05%
Average PM2.5
6.640 ug/m3
NDS Air Quality Score
64.95
U.S. County Rank
327 of 1,049
Percentile
68.80
Grade
C
County status
San Francisco 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.