RANKABLE EPA COUNTY AQI
Hill Air Quality - Montana
EPA county-level evidence, NDS comparative intelligence, and 5 connected ZIP profiles.
Median AQI
13.0
Maximum AQI
157.0
Good-air-quality days
94.63%
Average PM2.5
3.766 ug/m3
NDS Air Quality Score
79.91
U.S. County Rank
123 of 1,049
Percentile
88.36
Grade
A
County status
Hill 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.