Atmospheric nitrogen compounds: Occurrence, composition and deposition

T. Nielsen, K. Pilegaard, A.H. Egeløv, K. Granby, P. Hummelshøj, N.O. Jensen, H. Skov

    Research output: Contribution to journalConference articleResearchpeer-review


    Traffic in cities and on highways is an important contributor to NOy atmospheric pollution in open areas. In this situation both the concentration and composition of NOy compounds show a wide variation and are dependent on meteorological and atmospheric chemical conditions. The proportion of NOz compounds (HNO3+nitrate+PAN+ PPN+N2O5+organic nitrates) increases while that of NOx decreases with increasing ozone concentrations. The dry deposition velocity of NO2 was determined to be 0.2 cm s(-1) above vegetation. The dry deposition contribution of the different NOy compounds was evaluated. The possibility that a significant contribution is caused by a group of unidentified NOy compounds cannot be excluded. Therefore, future investigations of atmospheric pollution of sensitive ecosystems, at conditions with a relatively high atmospheric content of NOy compared to that of NH3, ought to take into consideration the possible contribution from unidentified NOy compounds. This also implies that atmospheric research into the identity, occurrence, sources and sinks of these compounds-as well as further developments of sampling and analytical methods-should be given a high priority.
    Original languageEnglish
    JournalScience of the Total Environment
    Pages (from-to)459-465
    Publication statusPublished - 1996
    EventInternational Symposium on Highway and Urban Pollution - WHO European Off , Copenhagen, Denmark
    Duration: 22 May 199524 May 1995
    Conference number: 5


    ConferenceInternational Symposium on Highway and Urban Pollution
    LocationWHO European Off
    SponsorWHO Regional Office for Europe


    • nitrogen oxides
    • nitric acid
    • particulate nitrate
    • peroxyacetyl nitrate
    • organic nitrates
    • NOy
    • residual NOy
    • atmospheric reactions
    • deposition


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