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Abstract

Two intensive monitoring campaigns of conventional and non-conventional pollutants (aromatic hydrocarbons and photo-oxidants) were performed in Brussels in summer 1993 and winter 1994 and are reported in this publication. These campaigns were intended to characterize the air quality levels in a representative area of the city centre. Point monitors were located on both sides of a high traffic street while two differential optical absorption spectroscopy (DOAS) instruments were installed at 3 m above the street and above the roof tops. Correlations between chemical and meteorological parameters, concentrations measured at different sites at the street level and/or measured at different altitude above the street have been analyzed. The results have been used to evidentiate the chemical processes and to evaluate the concentration gradients in and around a street. The measurements at different sites have been demonstrated to be representative for air pollution in a street. While good correlations have been observed between primary pollutants in both seasons, a fast photochemical conversion of toluene by OH radical has been observed above the roofs tops in summer.

Additional information

Authors: SANDRONI S, JRC Ispra (IT);CERUTTI C, JRC Ispra (IT);NORIEGA A, JRC Ispra (IT);PALMGREN F, NERI, Roskilde (DK)
Bibliographic Reference: EUR 16091 EN (1994) 38pp., FS, free of charge
Availability: Available from the Public Relations and Publications Unit, JRC Ispra, I-21020 Ispra (IT)
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