The influence of vehicle emission characteristics and meteorological conditions on urban N0₂ concentrations
by Jari Harkonen, Jaakko Kukkonen, Esko Valkonen, An Karppinen
International Journal of Vehicle Design (IJVD), Vol. 20, No. 1/2/3/4, 1998

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/NO_x fraction and meteorological conditions on the ambient air NO₂ concentrations. We have applied the road network dispersion model CAR-FMI in the computations.

Online publication date: Mon, 18-Aug-2003

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