Site

State

PM AQI* (ug/m3)

Hurst Road

AK

36

Portola

CA

33

A Street

AK

27

Salmon PM2.5

ID

21

Harrisburg

PA

21

Libby Courthouse

MT

19

Albany

NY

18

Cave Junction Forest Service

OR

18

Bennington

VT

18

Omak-Colville Tribe

WA

17