Site

State

PM AQI* (ug/m3)

Cut Bank

MT

9

Boundary County

ID

7

Rossiter Pump House

MT

6

St. Maries

ID

6

Porthill

BC

6

French Town - Beckwith

MT

6

Plummer CDA Tribe

ID

5

Libby Courthouse

MT

5

Sidney 201

MT

5

Lewiston

ID

5