RANKABLE EPA COUNTY AQI
St. Louis Air Quality - Missouri
EPA county-level evidence, NDS comparative intelligence, and 25 connected ZIP profiles.
Median AQI
51.0
Maximum AQI
738.0
Good-air-quality days
47.68%
Average PM2.5
7.701 ug/m3
NDS Air Quality Score
19.13
U.S. County Rank
959 of 1,049
Percentile
8.40
Grade
F
County status
St. Louis 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.