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"Local background" levels of carbon monoxide in an urban area

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Listed:
  • Larson, Timothy
  • Moseholm, Lars
  • Slater, David
  • Cain, Cyra

Abstract

The objective of this study was to obtain a better understanding of carbon monoxide (CO) concentrations immediately upwind of urban roadways, the "local background" values, and how these concentrations depend upon the surrounding traffic and the general meteorology. Measurements were made at seven sites in Seattle, WA during the winter of 1993. Local background CO concentrations were characterized by an absence of short term fluctuations, a steady buildup during the 3 p.m. to 11 p.m. period, and a lack of spatial gradients in the 8-h average values. Distinctly different log-normal distributions of the 8-h averages were observed for "trafficked" sites versus "urban park" sites, with mean values of 1.6 and 1.0 ppm respectively. A simple regression model was developed to predict the local background CO that includes distance from roadway, average daily traffic of nearby roadways, and the frequency of occurrence of low wind speeds (R2 = 0.74; F = 170).

Suggested Citation

  • Larson, Timothy & Moseholm, Lars & Slater, David & Cain, Cyra, 1996. ""Local background" levels of carbon monoxide in an urban area," Transportation Research Part A: Policy and Practice, Elsevier, vol. 30(6), pages 399-413, November.
    • Handle: RePEc:eee:transa:v:30:y:1996:i:6:p:399-413
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    References listed on IDEAS

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    1. Matzoros, Athanasios & Van Vliet, Dirck, 1992. "A model of air pollution from road traffic, based on the characteristics of interrupted flow and junction control: Part II -- model results," Transportation Research Part A: Policy and Practice, Elsevier, vol. 26(4), pages 331-355, July.
    2. Matzoros, Athanasios & Van Vliet, Dirck, 1992. "A model of air pollution from road traffic, based on the characteristics of interrupted flow and junction control: Part I -- model description," Transportation Research Part A: Policy and Practice, Elsevier, vol. 26(4), pages 315-330, July.
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