LOCAL BACKGROUND LEVELS OF CARBON MONOXIDE IN URBAN AREAS. FINAL TECHNICAL REPORT

The objective of this study was to obtain a better understanding of 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 during the winter of 1993. Local background CO concentrations were characterized by an absence of short term fluctuations, a steady buildup during the period between 3:00 PM and 11:00 PM, and a lack of spatial gradients in the eight-hour average values. Distinctly different log-normal distributions of the eight-hour 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. This regression model included distance from the roadway, average daily traffic on nearby roadways, and the frequency of low wind speeds (R-squared = 0.74; F = 170). A new CO sampler was also developed as a part of this project.

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  • Corporate Authors:

    Washington State Transportation Center

    University of Washington, 1107 NE 45th Street, Suite 535
    Seattle, WA  United States  98105

    Washington State Department of Transportation

    Transportation Building, 310 Maple Park Avenue SE, P.O. Box 47300
    Olympia, WA  United States  98504-7300

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Larson, T
    • Moseholm, L
    • Cain, C
    • SLATER, D
  • Publication Date: 1994-7

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 149 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00667596
  • Record Type: Publication
  • Report/Paper Numbers: WA-RD 339.1
  • Contract Numbers: Agreement T9233, Task 37
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Oct 5 1994 12:00AM