RANKABLE EPA COUNTY AQI
Billings Air Quality - North Dakota
EPA county-level evidence, NDS comparative intelligence, and 7 connected ZIP profiles.
Median AQI
40.0
Maximum AQI
195.0
Good-air-quality days
80.25%
Average PM2.5
6.807 ug/m3
NDS Air Quality Score
40.25
U.S. County Rank
700 of 1,049
Percentile
33.11
Grade
D
County status
Billings 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.