Ambient air quality modeling of carbon monoxide is dependent on accurate mobile source emission factors. The paper examines the sensitivity of emission factor projections to input parameters such as ambient temperature, hot-cold sighting, average route speed, vehicle deterioration, and growth rate. The ability to estimate cold vehicle operation at low ambient temperature is as important to localized emission prediction as is the estimation of growth rates and emissions from future emission control technology vehicles. Analysis of existing data indicates that localized emission factors are needed since projected reductions in emissions from base-line levels are not independent of vehicle operating mode. Present emission factors and planned refinements to EPA Publication AP-42 are discussed. /Author/

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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 the Art of Assessing Transportation-Related Air Quality Impacts, Washington, D.C. October 22-24, 1975.
  • Corporate Authors:

    Transportation Research Board (TRB)

    Washington, DC   
  • Authors:
    • Williams, Marcia E
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  • Publication Date: 1976

Media Info

  • Media Type: Digital/other
  • Features: References; Tables;
  • Pagination: pp 176-189
  • Monograph Title: Assessing transportation-related air quality impacts
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Filing Info

  • Accession Number: 00139663
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Sep 16 1977 12:00AM