Site

State

PM AQI* (ug/m3)

The Dalles - Cherry Heights

OR

18

Hermiston - Municipal Airport

OR

16

Sunnyside-S 16th

WA

15

Pendleton - McKay Creek

OR

15

Walla Walla-12th St

WA

13

Dayton-W Main

WA

11

Kennewick-Metaline

WA

11

Marysville-7th Ave

WA

10

Clarkston-13th St

WA

10

Mesa-Pepoit Way (temp SO)

WA

10