Site

State

PM AQI* (ug/m3)

Sunnyside-S 16th

WA

43

Pendleton - McKay Creek

OR

28

Maple Falls-Azure Way

WA

24

Newport-Calispel

WA

21

Ontario May Roberts Element...

OR

21

Toppenish-Yakama Tribe

WA

21

Salem - State Hospital

OR

20

John Day Dayton St

OR

20

Hermiston - Municipal Airport

OR

19

Hood River West Side FD

OR

18