Site

State

PM AQI* (ug/m3)

Broadus

MT

15

Billlings Lockwood

MT

13

Plummer CDA Tribe

ID

11

St. Maries

ID

10

Bozeman High School

MT

10

Malta

MT

9

Fargo NW

ND

9

Birney

MT

9

Grangeville

ID

9

Libby Courthouse

MT

9