RANKABLE EPA COUNTY AQI
Richland Air Quality - Montana
EPA county-level evidence, NDS comparative intelligence, and 6 connected ZIP profiles.
Median AQI
39.0
Maximum AQI
165.0
Good-air-quality days
86.74%
Average PM2.5
5.373 ug/m3
NDS Air Quality Score
53.32
U.S. County Rank
514 of 1,049
Percentile
50.86
Grade
C
County status
Richland is part of the governed NDS rankable EPA county universe.
Methodology
EPA AQI evidence used here is county-derived. ZIP profiles connect to this evidence through the governed NDS geography relationship.