RANKABLE EPA COUNTY AQI
Contra Costa Air Quality - California
EPA county-level evidence, NDS comparative intelligence, and 46 connected ZIP profiles.
Median AQI
48.0
Maximum AQI
94.0
Good-air-quality days
53.46%
Average PM2.5
6.837 ug/m3
NDS Air Quality Score
27.11
U.S. County Rank
867 of 1,049
Percentile
17.18
Grade
F
County status
Contra Costa 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.