RANKABLE EPA COUNTY AQI
Boulder Air Quality - Colorado
EPA county-level evidence, NDS comparative intelligence, and 31 connected ZIP profiles.
Median AQI
50.0
Maximum AQI
119.0
Good-air-quality days
50.92%
Average PM2.5
6.381 ug/m3
NDS Air Quality Score
18.88
U.S. County Rank
963 of 1,049
Percentile
8.02
Grade
F
County status
Boulder 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.