Site

State

PM AQI* (ug/m3)

Broadus

MT

10

Bismarck Residential

ND

6

Beulah North

ND

6

Billlings Lockwood

MT

5

Juliaetta E-sampler

ID

5

Porthill

BC

5

Hannover

ND

4

Havre

MT

4

Libby Courthouse

MT

4

Sandpoint U of I

ID

4

Grangeville

ID

4