Site

State

AQI*

French Town - Beckwith

MT

18

Lewiston

ID

17

Missoula Boyd Park

MT

16

St. Maries

ID

15

Rossiter Pump House

MT

13

Butte Greely School

MT

13

Grangeville

ID

13

Libby Courthouse

MT

12

Fargo NW

ND

11

Columbia Falls

MT

10