RANKABLE EPA COUNTY AQI
Siskiyou Air Quality - California
EPA county-level evidence, NDS comparative intelligence, and 19 connected ZIP profiles.
Median AQI
6.0
Maximum AQI
10.0
Good-air-quality days
100.00%
Average PM2.5
5.529 ug/m3
NDS Air Quality Score
93.17
U.S. County Rank
17 of 1,049
Percentile
98.47
Grade
A+
County status
Siskiyou 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.