Record Display for the EPA National Library Catalog


Main Title Effects of Traffic Speed on the Ambient Pollutant Concentration Near Roadways.
Author Petersen, W. B. ; Eskridge, R. E. ; Rao, S. T. ; Pagnotti, V. ;
CORP Author New York State Dept. of Environmental Conservation, Albany.;Environmental Sciences Research Lab., Research Triangle Park, NC.
Year Published 1984
Report Number EPA-810475; EPA-600/D-84-102;
Stock Number PB84-177856
Additional Subjects Air pollution ; Roads ; Traffic surveys ; Mathematical models ; Wake detection ; Exhaust emissions ; Turbulence ; Concentration(Composition) ; Velocity ; Carbon monoxide ; Wind velocity ;
Library Call Number Additional Info Location Last
NTIS  PB84-177856 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 19p
In the numerical roadway model, the vehicle wake diffusion is dependent upon the turbulent kinetic energy, which is proportional to the square of the relative wind speed on the moving vehicles. This model predicts that turbulent mixing and hence pollutant concentration on and downwind of the roadway are dependent on the vehicle speeds. The Long Island Expressway CO data provide an opportunity to test the theoretical predictions on the effect of traffic speed on the ambient concentrations. It is observed that the traffic speed does not affect the dispersion process as long as the ambient atmospheric conditions are neutral or unstable. Sufficient data are not available to quantify the role of traffic speed on the ambient concentrations downwind of the roadway under stable atmospheric conditions. Since commonly used Gaussian dispersion models do not account for traffic generated turbulence properly, it is possible that the current versions of these models underestimate pollutant concentration adjacent to the roadway under stable atmospheric conditions with low traffic speeds.