RANKABLE EPA COUNTY AQI
Flathead Air Quality - Montana
EPA county-level evidence, NDS comparative intelligence, and 19 connected ZIP profiles.
Median AQI
40.0
Maximum AQI
80.0
Good-air-quality days
82.06%
Average PM2.5
6.932 ug/m3
NDS Air Quality Score
54.38
U.S. County Rank
497 of 1,049
Percentile
52.48
Grade
C
County status
Flathead 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.