Site

State

PM AQI* (ug/m3)

Libby Courthouse

MT

14

St. Maries

ID

13

Pinehurst

ID

11

Great Falls Overlook Park

MT

9

Seeley Elementary School

MT

9

Lewistown

MT

9

Malta

MT

8

Rossiter Pump House

MT

8

Cut Bank

MT

8

Miles City

MT

7