1. Sources of Haze - North Cascades and Mt. Rainier National Parks
Keith Rose
EPA, Region 10
WRAP IWG Meeting
August 30, 2006

2. Introduction
Objective - Identify sources within geographic areas responsible for the worst visibility days in the North Cascades and Mt. Rainier National Parks in 2003
Used VIEWS reconstructed species (SO4, NO3, OCM, and EC) Bext to determine species contribution to haze for 20% worst visibility days
Used VIEWS back trajectories to determine sources of air parcels on worst visibility days

3. Mt. Rainier Back Trajectory 4-21-03

5. Sources
SO4 – Point, area, and mobile sources in Portland and along the I-5 corridor in western OR
Total Bext = 45 Mm-1 (20% worst > 41 Mm-1)

6. Mt. Rainier Back Trajectory 6-8-03

8. Sources NO3 – Centralia Power Plan SO4 – Offshore marine vessels
OCM – Biogenic emissions and/or fires in BC (OC/EC = 5.8)
Total Bext = 57 Mm-1

9. Mt. Rainier Back Trajectory 7-11-03

11. Sources
SO4 – Point, area, and mobile sources in Portland area, and offshore marine vessels
Total Bext = 41 Mm-1

12. Mt. Rainier Back Trajectory 8-7-03

14. Sources
SO4 – Point, area, and mobile sources in Portland and along the I-5 corridor in western OR
OCM – Point, area, and mobile sources in Portland and along the I-5 corridor in western OR
Total Bext = 56 Mm-1

15. Mt. Rainier Back Trajectory 9-3-03

17. Sources
SO4 – Point, area, and mobile sources in Puget Sound and Vancouver area
OCM – Wildfires in northern WA and BC (OC/EC = 3.5)
Total Bext = 72 Mm-1

18. North Cascades Back Trajectories 4-21-03

20. Sources
SO4 – Point, area, and mobile sources in the Columbia Gorge and Portland area
OCM – Agricultural burning in eastern WA and OR?
Total Bext = 32 Mm-1 (20% worst > 28 Mm-1)

21. North Cascades Back Trajectories 7-11-03

23. Sources
SO4 – Point, area, and mobile sources in Puget Sound, and offshore marine vessels
OCM – Point, area and mobile sources in Puget Sound
Total Bext = 31 Mm-1

24. North Cascades Back Trajectories 7-26-03

26. Sources
SO4 – Point, area, and mobile sources in Vancouver area, and offshore marine vessels
Total Bext – 43 Mm-1

27. North Cascades Back Trajectories 9-3-03

29. Sources
OCM – Wildfires in BC (OC/EC = 7.3)
Total Bext = 334 Mm-1

30. North Cascades Back Trajectories 10-3-03

32. Sources High OCM – Wildfires in BC and Alberta (OC/EC = 6.6)
Total Bext = 137 Mm-1

33. Summary – Mt. Rainier Visibility impacted primarily by:
SO4 from point, area, and mobile sources in Puget Sound and western OR (April-Oct)
SO4 from marine vessels (April-Oct)
OCM from wildfires in northern WA and BC (Aug-Oct)

34. Summary – North Cascades
Visibility impacted primarily by:
SO4 from point, area, and mobile sources in Puget Sound and Vancouver area (April-July)
SO4 from marine vessels (April-July)
OCM from wildfires in BC (Aug-Oct)