Dispersion of pollutants and estimation of emissions in a street canyon in Rouen, France

  • Authors:

  • A. Ghenu;J. -M. Rosant;J. -F. Sini

  • Affiliations:

  • Laboratoire de Mécanique des Fluides, UMR 6598 CNRS, Ecole Centrale de Nantes, B.P. 92101, F-44321 NANTES Cedex 3, France;Laboratoire de Mécanique des Fluides, UMR 6598 CNRS, Ecole Centrale de Nantes, B.P. 92101, F-44321 NANTES Cedex 3, France;Laboratoire de Mécanique des Fluides, UMR 6598 CNRS, Ecole Centrale de Nantes, B.P. 92101, F-44321 NANTES Cedex 3, France

  • Venue:
  • Environmental Modelling & Software
  • Year:
  • 2008

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Abstract

A six-week data set with simultaneous measurements of gaseous pollutants (NO"x and CO) and particle matter (PM"2"."5) inside an urban street canyon and nearby urban background location in Rouen (France) is presented. The experimental results for working days and weekends show the effects on the pollutant dispersion. The background/street concentrations mean ratios are 0.32 for CO, 0.43 for NO"x and 0.67 for PM"2"."5. The OSPM model was used in two ways: (i) to model the pollutant concentrations in the street canyon (direct modeling) and (ii) to predict the traffic emissions from the measured concentrations (inverse simulation). An estimation of the hourly emission factors is obtained for NO"x, CO and PM"2"."5 for working days and Sundays; a daily emission factor is also given. Mean emission factors per vehicle are 0.64g NO"x/km veh, 7.5g CO/km veh and 0.060g PM"2"."5/km veh for the working days.