Site

State

PM AQI* (ug/m3)

Beulah North

ND

17

Seeley Elementary School

MT

14

Libby Courthouse

MT

13

Pinehurst

ID

11

St. Maries

ID

11

Fargo NW

ND

11

Rossiter Pump House

MT

10

Nursery Rd.

ID

9

Hannover

ND

9

Lewiston

ID

9