Site

State

PM AQI* (ug/m3)

Libby Courthouse

MT

19

Sidney 201

MT

18

St. Maries

ID

13

Great Falls Overlook Park

MT

13

Pinehurst

ID

13

Seeley Elementary School

MT

11

Bismarck Residential

ND

11

Rossiter Pump House

MT

11

Beulah North

ND

10

Hannover

ND

9