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1G - Long-range transport of pollutants (chemicals) (WE13/2) Regional trends of PBTs in ambient air. Holoubek, Ivan1, Brorstrom-Lunden, Eva2, Klanova, Jana1, Kohoutek, Jiri 1, Jech, Libor3, Shatalov, Victor4, Malanishev, Alexander4, 1 Masaryk University, Brno, Czech Republic, Czech Republic2 IVL, Gothenburg, Sweden, Sweden3 AXYS-Varilab, Praha, Czech Republic, Czech Republic4 EMEP MSC East, Moscow, Russia, Russia ABSTRACT- Air is an important transport medium for persistent toxic substances (PTS) in general. Reporting ambient air concentrations reflects the concentration during the sampling period but, due to rapid transport and fast mixing of pollutants in air, PTS concentrations will change quite rapidly. Persistent organic pollutants were included in EMEP monitoring programme in 1999. Data for PTS have been reported only from countries around the North and Baltic Seas, in the Arctic and from the Czech Republic. For the assessment of PTS contamination both on regional and global levels a complex monitoring and modelling approach seems to be reasonable. This approach includes arrangement of superstation network, model assessment of contamination levels and carrying out nationally based measurement campaigns. Apart from direct assessment of contamination measurement data can be used for model verification and formulation. Since there are not so many measurement data on PTS concentrations in various environmental compartments, modelling plays significant role in the assessment of PTS contamination. Measurements allow one to follow time trends of contamination at some monitoring sites. For example, the concentration level of some chlorinated pesticides and polychlorinated biphenyls at the some from the Baltic stations and the Czech one, are decreasing. For other stations no clear trends can be noticed for the relatively short period of monitoring. Comparison of calculated and measured data shows reasonable agreement. These trends will be presented with the using of comparison of data from Sweden, Finland, Norway and Czech Republic. Key words: Regional distribution, PBTs, Trends, Monitoring and modelling |
