A modelling exercise was performed quantifying the influence of NO2 sources on the NO2 air quality at a heavy traffic urban site as well as in the urban background for 2005 and extrapolated to 2010. Contributions of the local traffic emissions, the urban background and atmospheric chemistry as sources for NO2 were considered in respective scenarios. Results show that the NO2 ambient concentration at the heavy traffic site predominantly is determined by the background NO2 concentration. Also, it is substantially determined by atmospheric chemistry due to the reaction of locally emitted NO with ozone. The contribution of primary emitted NO2 from traffic emissions is lower, though still significant. In the case of the urban background site the direct NO2 traffic emission is not relevant, as on this time scale background mixing and atmospheric chemistry dominate. Furthermore, the extrapolations to 2010 show that a decline of the NO2 concentration will occur even at the heavy traffic site, despite the anticipated increase of the NO2/NOx ratio. The further increase of the NO2/NOx emission ratio and the increasing ozone urban background concentration will be compensated by the overall declining NOx emissions of the local traffic and the continuously decreasing NOx background concentration.


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    Title :

    Analysis of urban NO2 sources and their effect on NO2 air quality


    Additional title:

    Analyse städtischer NO2-Quellen und deren Einfluss auf NO2-Luftqualität


    Contributors:


    Publication date :

    2007


    Size :

    9 Seiten, 11 Bilder, 1 Tabelle, 7 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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