RANKABLE EPA COUNTY AQI
St. Louis Air Quality - Missouri
EPA county-level evidence, NDS comparative intelligence, and 51 connected ZIP profiles.
Median AQI
39.0
Maximum AQI
93.0
Good-air-quality days
88.51%
Average PM2.5
8.160 ug/m3
NDS Air Quality Score
61.90
U.S. County Rank
367 of 1,049
Percentile
64.98
Grade
C
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.