RANKABLE EPA COUNTY AQI

Powder River Air Quality - Montana

EPA county-level evidence, NDS comparative intelligence, and 5 connected ZIP profiles.

Median AQI

44.0

Maximum AQI

195.0

Good-air-quality days

68.73%

Average PM2.5

5.355 ug/m3

NDS Air Quality Score

31.23

U.S. County Rank

810 of 1,049

Percentile

22.61

Grade

County status

Powder River is part of the governed NDS rankable EPA county universe.

EPA AQI evidence used here is county-derived. ZIP profiles connect to this evidence through the governed NDS geography relationship.