Site
State
PM AQI* (ug/m3)
Thirty Third
AZ
43
West Phoenix
37
Portola
CA
34
John Day Dayton St
OR
29
Durango Complex
Mammoth Lakes
Omak-Colville Tribe
WA
28
Salmon PM2.5
ID
27
Clinton, Chancy Park
IA
26
Libby Courthouse
MT