Site

State

PM AQI* (ug/m3)

St. Maries

ID

21

Lewiston

ID

13

Sidney 201

MT

13

Beulah North

ND

10

Grangeville

ID

9

Malta

MT

9

Billlings Lockwood

MT

8

Kamiah-ID

ID

7

Bozeman High School

MT

7

Great Falls Overlook Park

MT

7