Site	State	PM AQI* (ug/m3)
Yakima-4th Ave	WA	31
Toppenish-Yakama Tribe	WA	28
Sunnyside-S 16th	WA	26
Twisp-Glover St	WA	20
Pendleton - McKay Creek	OR	19
Ellensburg-Ruby St	WA	18
John Day Dayton St	OR	18
Darrington-Fir St	WA	17
Omak-Colville Tribe	WA	16
Grants Pass - Parkside School	OR	15