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

摘要

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 0.64 g NO_x/km veh, 7.5 g CO/km veh and 0.060 g PM_(2.5)/km veh for the working days.