Site

State

PM AQI* (ug/m3)

Hillsboro - Hare Field

OR

25

Eugene - Amazon Park

OR

24

Corvallis - Circle Blvd.

OR

23

Yakima-4th Ave

WA

23

Grants Pass - Parkside School

OR

23

Portland Near Road

OR

22

Roseburg - Garden Valley Blvd.

OR

22

John Day Dayton St

OR

22

Omak-Colville Tribe

WA

21

Colville-E 1st St

WA

20