Columbia River Gorge Study

Visibility Progress Report to Gorge Commission

• Visibility Update 1/13/2015 (PPT)

Air Director's Update to Gorge Commission

• Commission Update 9/9/2014 (PPT)

WRAP Regional Haze Program

• Reasonable Progress Summary Report (PDF)

Gorge Air Quality Strategy

• Columbia Gorge Air Strategy Document - Final September 2011 (PDF - 660KB)

Gorge Policy Day

• Meeting Agenda (PDF)
• Gorge Strategy Fact Sheet (PDF)
• Draft Gorge Strategy Document (PDF)

Science Summary

• Science Summary Report for September 24, 2007 - Draft (PDF - 1.35 Mb)
• Science Summary Report for February 8, 2008 - Final (PDF - 1.29 Mb)

Causes of Haze in the Gorge (CoHaGo) Report

• Draft CoHaGo Report (PDF - 5.5 Mb)
• Final CoHaGo Report (PDF - 5.9 Mb)

Gorge Modeling Report

• Final Gorge Modeling Report 8-28-07.pdf (PDF - 4.75 Mb)

Gorge Emission Inventory Report

• Gorge Air Quality Emission Inventory Report Final 1-31-08 (PDF - 914 kb)

Quick Links

• Presentations
• Background Data

Core Environmental - Aerosols and Haze in the Gorge

• "On the Composition and Patterns of Aerosols and Haze Within the Columbia River Gorge September 1, 1996 - September 31, 1998," Core Environmental Consulting, January 12, 2001 CoreEnvCompositionandPatternsofHaze.pdf (PDF - 351 kb)

Visibility and Air Quality in the Gorge

• "Columbia River Gorge Visibility and Air Quality Study Working Draft: Existing Knowledge and Additional Recommended Scientific Assessment to Consider," Mark C. Green, DRI, June 7, 2001 (updated July 26, 2001) VisibilityAndAirQuality.pdf (PDF - 1.4 Mb)

CBM Study
Chemical Mass Balance Source Apportionment of PM_2.5 Aerosol in the Columbia River Gorge

• CMB Final Report, Hampden Kuhns, DRI. March 28, 2003 (PDF - 8.2 Mb)

Gorge Calpuff Footprint Analysis - WSU

• Columbia River Gorge National Scenic Area Source Footprint Analysis Using CALPUFF and CMAQ Modeling Systems (Word doc - 0.97 Mb) April 1, 2003
• Trajectory graphic (jpg - 65 kb)

Study Plan

• Strawman Study Plan - DRI, March 5, 2001 (PDF - 928 kb)
• Working Draft: Existing Knowledge and Additional Recommended Scientific Assessment to Consider, June 7, 2001 (PDF - 1.4 Mb)
• Columbia River Gorge Air Quality Project Work Plan, July 30, 2001 (PDF - 1 Mb)
• Work Plan Addendum, July 25, 2003 (PDF - 167 kb)
• Redesigned Technical Study Plan, July 25, 2003 (PDF - 345 kb)
• Redesigned Technical Study Plan Rev. 1, June 15, 2004 (PDF - 389 kb)

Fog Water Deposition in the Columbia River Gorge - Phase 1

• Atmospheric deposition inputs and effects on lichen chemistry and indicator species in the Columbia River Gorge (PDF - 1.9 Mb)

Atmospheric Nitrogen Deposition

• Thresholds for Protecting Pacific Northwest Ecosystems from Atmospheric Deposition of Nitrogen (PDF 1.9 Mb)

Ozone Injury in West Coast Forests

This report covers six years of monitoring for ozone injury by the Pacific Northwest Research Station Forest Inventory and Analysis Program:

• Ozone Injury in West Coast Forests (PDF - 2.3 Mb)

Air Quality Trends in the Gorge - Historical Data

• Updated Air Quality Trends (PDF - 743 kb)
• Who is Polluting the Columbia River Gorge - Final Report by Dan Jaffe (PDF - 707 kb)
• Analysis of 12 years of IMPROVE data in the Columbia River Gorge, presentation by Dan Jaffe (Power Point - 4.7 Mb)

Columbia Gorge Haze Gradient Study

The link below is the Columbia Gorge Haze Gradient Study. Note that at the end is an appendix with time series plots of daily average bsp for each of the nine sites.

• Final Haze Gradient Study (PDF - 4.9 Mb)

Gorge Emission Inventory

• WRAP Emissions Inventory - Point and Area Sources (PDF - 1.3 Mb)
• WRAP Emissions Inventory - Mobile and Non-Road Sources (PDF - 3.4 Mb)
• SWCAA - ODEQ 2004 Point and Selected Area Sources Inventory
  June 30, 2006 (PDF - 4.4 Mb)
• Gorge Emission Inventory for August 18, 2004 and November 12, 2004 - results from Modeling Analysis - for August 15, 2007 conference Call (PDF - 613 kb)
• Gorge Emission Inventory for August 18, 2004 and November 12, 2004 - results from Modeling Analysis - for August 24, 2007 conference Call (PDF - 749kb)

Gorge Modeling Protocol

The link below is for a draft modeling protocol from Environ.

• Draft Modeling Protocol (PDF - 4.8 Mb)
• Final Modeling Protocol (PDF - 4.1 Mb)

Gorge CAMx Modeling Report

The link below is for the modeling report for the Gorge and represents a summary of the above identified presentations for CAMx Modeling.

• DraftGorgeModelingReport7-3-07.pdf (PDF - 4.74 Mb)
• Final Gorge Modeling Report 8-28-07.pdf (PDF - 4.75 Mb)

Comments on above CAMx Modeling Report:

• Kent Norville, Air Sciences (PDF - 63 kb)
• Richard Graw, US Forest Service (PDF - 568 kb)
• Ken Maddox, Hood River, OR (PDF - 8 kb)
• Sam Hartsfeld, Port of Portland (PDF - 28 kb)
• Paul Mairose, Southwest Clean Air Agency (PDF - 9 kb)

Gorge Air Quality Trends - Air Sciences Report

• Air Quality Trends Report (PDF - 743 kb)
• CRGNSA Air Quality Trends (PDF - 464 kb)

Air Quality Trends in the Gorge - Historical Data

• Updated Air Quality Trends (PDF - 743 kb)
• Who is Polluting the Columbia River Gorge - Final Report by Dan Jaffe (PDF - 707 kb)
• Analysis of 12 years of IMPROVE data in the Columbia River Gorge, presentation by Dan Jaffe (Power Point - 4.7 Mb)

Analyses of the Causes of Haze for the Central States (Phase II) and Summary of Findings - Exeutive Summary

Prepared for Central States Regional Air Planning Association by Sonoma Technology

• Analyses of the Causes of Haze Phase II Executive Summary (PDF - 17 Mb)