Site

State

AQI*

Libby Courthouse

MT

14

Seeley Elementary School

MT

14

Sidney 201

MT

14

St. Maries

ID

13

TRNP-NU

ND

10

Malta

MT

10

Lake Ilo

ND

9

Thompson Falls HS

MT

9

Boundary County

ID

8

Billlings Lockwood

MT

7