Site

State

PM AQI* (ug/m3)

St. Maries

ID

21

Libby Courthouse

MT

19

Rossiter Pump House

MT

16

Williston

ND

14

Pinehurst

ID

12

Lake Ilo

ND

10

Malta

MT

10

Beulah North

ND

10

Billlings Lockwood

MT

10

Bismarck Residential

ND

9