Site

State

PM AQI* (ug/m3)

Toppenish-Yakama Tribe

WA

9

Tacoma-S 36th St

WA

5

Colbert-Greenbluff

WA

5

Seattle-South Park

WA

5

Spokane-Augusta Ave

WA

4

Spokane-E Broadway Ave

WA

4

Springfield City Hall

OR

4

Eugene - Highway 99

OR

4

Tacoma-Alexander Ave

WA

3

Spokane-Monroe St.

WA

3