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Levels of NO(2) concentrations in the atmosphere have been evaluated in the Greater Toulouse area with diffusive samplers in the framework of a collaborative study between the Observatoire Régional de l'Air en Midi-Pyrénées (ORAMIP) and the Central Laboratory of Air Pollution (CLAP) of the European Commission. The aim of the study was to assess the distribution of NO(2) concentrations in the area and check the regional monitoring network with respect to the requirements of the EC directive. Two surveys, each of 3 months duration, were carried out in summer 1991 and winter 1992. The 140 diffusive samplers, homogeneously distributed in the area, were substituted every fortnight during twelve monitoring periods. The present Toulouse area survey highlighted again the use of the diffusive sampling technique as an interesting tool for network design purposes. However, according to the EC Directives now in use, there is a difficulty of comparison between reference terms of limit values of the Directive (on the basis of hourly averages) and reference terms of the diffusive method (two week samplings). In addition, the density of stations should be harmonised on an identical basis for each urban network, in relation to measurable parameters, including distribution of both pollution and population density.

Additional information

Authors: DELLA MASSA J P, Observatoire Régional de l'Air en Midi Pyrénées, Colomiers (FR);GERBOLES M, JRC Ispra (IT);PAYRISSAT M, JRC Ispra (IT)
Bibliographic Reference: EUR 15567 FR (1994) 76 pp., FS, free of charge
Availability: Available from Joint Research Centre, Publication Department, I-21020 Ispra (Va.) (IT)
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