Spatial and Seasonal Patterns and Temporal Variability of Haze and its Constituents in the United States:  Report IV

November 2006

Principle Author:  Linsey J. Debell¹

Contributors: Kristi A. Gebhart², William C. Malm², Marc L. Pitchford³, Bret A. Schichtel² and Warren H. White⁴

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Cover Page

Title Page and Table of Contents

Overview and Summary

Chapter 1  – IMPROVE Network – Purpose, Design, and History

Chapter 2 - Spatial Distributions of Reconstructed Mass and Mass Budgets and Reconstructed Light Extinction and Light-Extinction Budgets

 Chapter 3 - Spatial Variability of Average Monthly Patterns in Fine Aerosol Species Concentrations and Particulate Extinction Coefficients

Chapter 4 - Temporal Trends in Fine Aerosol Species Concentrations and Aerosol Extinction

Chapter 5 - IMPROVE Data Quality Assurance

Chapter 6 - Special Monitoring Studies and Data Analyses Associated with the IMPROVE Program

Chapter 7 - Bibliography of Journal Articles using IMPROVE Data

Appendix A - Annual Average Reconstructed Fine Mass and Aerosol Extinction Budgets for Each Site

Appendix B - Seasonal and Annual Regional Reconstructed Fine Mass and Reconstructed Extinction Budgets

Appendix C - Average Monthly Bar Charts of Reconstructed Mass and Extinction of Constituent Species for each IMPROVE site

Appendix D - Articles Reporting on the Results from IMPROVE Special Monitoring Studies Conducted since 2000

Appendix E - An Assessment of Measurement Errors in the IMPROVE and STN Networks from In-Network and Cross-Network Collocated Data and the Estimated Comparability of Data Collected From the Two Networks

¹Cooperative Institute for Research in the Atmosphere (CIRA)

²National Park Service (NPS)

³National Oceanic and Atmospheric Administration (NOAA)

^{4University of  California, Davis}