Site

State

PM AQI* (ug/m3)

Maple Falls-Azure Way

WA

19

Eugene - Wilkes Dr.

OR

14

Chiloquin

OR

11

Lyons

OR

11

Portland - SE Lafayette

OR

10

Vancouver-NE 84th Ave

WA

9

Yacolt-Yacolt Rd

WA

8

Omak-Colville Tribe

WA

8

Tacoma-L St

WA

8

Spokane-E Broadway Ave (US)

WA

8