Calibration gases for existing air quality directive pollutants at limit values (LV)
1 Laboratoire National de métrologie et d’Essais (LNE), 1, rue Gaston Boissier, 75724 Paris Cedex 15, France
2 Eidgenössisches Institut für Metrologie (METAS), Lindenweg 50, 3003 Bern-Wabern, Switzerland
3 Finnish Meteorological Institute (FMI), Erik Palmenin aukio 1, 00560 Helsinki, Finland
4 Federal Environment Agency (Umweltbundesamt, UBA), Paul-Ehrlich Straße 29, 63225 Langen, Germany
5 Slovensky Metrologicky Ustav (SMU), Karloveska 63, 842 55 Bratislava 4, Slovak Republic
The European Directive (2008/50/EC) sets up, among other things, the limit values i.e. the maximum allowed concentrations at given time average in the air, for specified pollutants. Calibration of the measurement instruments needs to be performed at regular time intervals. In the framework of an European Joint Research Programme (JRP) named Metrology for Chemical Pollutants in Air (MACPoll) one task aims to provide harmonized dilution methods for air pollutant gases at low concentration for calibration and quality control purposes. The study focuses on the reactive gases nitrogen dioxide and sulphur dioxide at concentration levels corresponding to the limit values given in the European Directive (2008/50/EC). Nitrogen oxide (NO) is studied as well as NO2 because both of them are measured simultaneously for NOx. This work consists in improving the dilution methods for generating calibration standards for SO2, NO, NO2 at limit values and to validate them by an interlaboratory comparison.
© Owned by the authors, published by EDP Sciences, 2013
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