Site

State

PM AQI* (ug/m3)

Malta

MT

19

Billlings Lockwood

MT

11

TRNP-NU

ND

10

Lake Ilo

ND

10

Fargo NW

ND

9

Hannover

ND

8

Bozeman High School

MT

8

Beulah North

ND

8

Sidney 201

MT

8

RYDER

ND

8