Title: The influence of vehicle emission characteristics and meteorological conditions on urban N02 concentrations
Authors: Jari Harkonen, Jaakko Kukkonen, Esko Valkonen, An Karppinen
Addresses: Finnish Meteorological Institute, Air Quality Research, Sahaajankatu, 20 E, FIN-00810 Helsinki, Finland. Finnish Meteorological Institute, Air Quality Research, Sahaajankatu, 20 E, FIN-00810 Helsinki, Finland. Finnish Meteorological Institute, Air Quality Research, Sahaajankatu, 20 E, FIN-00810 Helsinki, Finland. Finnish Meteorological Institute, Air Quality Research, Sahaajankatu, 20 E, FIN-00810 Helsinki, Finland
Abstract: A major fraction of nitrogen oxides released from traffic is commonly nitrogen monoxide (NO); however, the proportion of NO2 in exhaust emissions can range from less than 1% to more than 50%. The released NO is chemically transformed into the more harmful nitrogen dioxide (NO2); the reaction time-scale is typically a few minutes in urban daylight conditions. This paper presents numerical results concerning the influence of the tailpipe NO2/NOx fraction and meteorological conditions on the ambient air NO2 concentrations. We have applied the road network dispersion model CAR-FMI in the computations.
Keywords: dispersion of air pollutants; nitrogen dioxide; vehicle emissions.
International Journal of Vehicle Design, 1998 Vol.20 No.1/2/3/4, pp.125-130
Published online: 18 Aug 2003 *
Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article