Site

State

PM AQI* (ug/m3)

Fargo NW

ND

9

Lewiston

ID

8

Great Falls Overlook Park

MT

7

Hannover

ND

6

Sidney 201

MT

6

Superior-109 2nd St

MT

6

Boundary County

ID

6

Libby Courthouse

MT

6

Kamiah-ID

ID

6

Bozeman High School

MT

6