Site

State

PM AQI* (ug/m3)

Yellowstone- Old Faithful S...

WY

37

West Yellowstone Park Ent #2

MT

32

Birney

MT

20

Bozeman High School

MT

16

Dillon

MT

14

Hannover

ND

13

Red Lodge

MT

13

Billlings Lockwood

MT

12

Sidney 201

MT

11

Miles City

MT

11