Site
State
PM AQI* (ug/m3)
Libby Courthouse
MT
23
Seeley Elementary School
16
Pinehurst
ID
15
St. Maries
11
Butte Greely School
10
Columbia Falls
9
Rossiter Pump House
Beulah North
ND
8
French Town - Beckwith
Lostwood NWR