Site

State

PM AQI* (ug/m3)

Plummer CDA Tribe

ID

13

TRNP-NU

ND

11

Fargo NW

ND

9

Billlings Lockwood

MT

7

Lewiston

ID

7

Broadus

MT

6

Rossiter Pump House

MT

6

Great Falls Overlook Park

MT

6

Lostwood NWR

ND

6

Seeley Elementary School

MT

5