ISSUES IN OXIDANT MODELING

Basic questions about oxidant control facing transportation planners and others responsible for formulating and implementing public options are considered, the problems of estimating the magnitudes of the directionality of oxidant changes are discussed, and issues relating to urban-based oxidant models and control strategies are addressed. The questions relating to what kind of emissions should be reduced in order to reduce oxidant concentrations, are addressed in papers presented in this special report. The papers cnclude that ambient air quality standard for oxidant in urban areas requires substantial reductions of emissions of hydrocarbons and other reactive organics in the area. Although reduction in nitrogen oxide emissions may be needed in urban areas, excessive reduction may increase the difficulty of controlling urban oxidant concentations. Papers are also presented which describe 4 techniques for the estimation of changes in oxidant concentrations resulting from changes in precursor emissions: linear or nonlinear rollback methods; smog chamber models; statistical models; and diffusion models. Recent findings that oxidant can be transported over distances of at least 30 miles and that high concentrations exist in rural aras have led to questions regarding urban oxidant models and control strategies. These questions are addressed in papers which conclude that elevated rural oxidant concentrations are attributable to man-made emission sources. However it was suggested at a workshop that the natural contribution may be a significant factor.

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    • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. Presented at the Conference on the State of Art of Assessing Transportation-Related Air Quality Impacts, Washington, D.C., October 22-24, 1975.
  • Corporate Authors:

    Transportation Research Board (TRB)

    Washington, DC   
  • Authors:
    • Horowitz, Joel
  • Conference:
  • Publication Date: 1976

Media Info

  • Media Type: Digital/other
  • Pagination: pp 5-7
  • Monograph Title: Assessing transportation-related air quality impacts
  • Serial:

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Filing Info

  • Accession Number: 00139647
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Sep 21 1981 12:00AM