Resumo

AZRI, C.; MAALEJ, A.; MEDHIOUB, K.  e  ROSSET, R.. Evolution of atmospheric pollutants in the city of Sfax (Tunisia) (October 1996-June 1997). Atmósfera [online]. 2007, vol.20, n.3, pp.223-246. ISSN 0187-6236.

The descriptive study related to the evolution of O₃, NO, NO₂, CO, SO₂, CH₄, NMHC and PM₁₀ concentrations in downtown Sfax showed, during the period October 1996-June 1997, that the city is significantly influenced by many sources and meteorological factors. The diurnal average concentrations of these species let appear at times some peculiarities due to the population local customs and also to particular meteorological conditions associated with predominant strong cyclonic situations (cut-off lows). Based on NO and CH₄, two species selected respectively as local and synoptic tracers, this descriptive study which is refined by a principal component analysis showed, out from these particular meteorological conditions, three components of the atmospheric pollution: a first component formed by CH₄ and in less degree NMHC showing the impact of synoptic sources, a second component containing NO, NO₂, CO, SO₂ and in less degree PM₁₀ and NMHC displaying the impact of local sources (vehicle and industrial sources), and finally a third component constituted by O₃ and in less degree PM1₀ presenting the impact of regional sources. Under the above quoted cyclonic situations, the distribution of such components was shown considerably modified.

Palavras-chave : Sfax; atmospheric pollutants; traffic and industrial sources; particular meteorological conditions; PCA.