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A preliminary assessment of major air pollutants in the city of Suzhou, China



A preliminary assessment of major air pollutants in the city of Suzhou, China



Atmospheric Environment 40(33): 6380-6395



Nitrogen oxides (NO2 and NOx), sulphur dioxide (SO2) and benzene, toluene, xylene (BTX) in ambient air were preliminarily assessed, by diffusive sampling technique, in 2003 through three measurement campaigns at 100 locations in the Chinese city of Suzhou. Statistical analysis of space series so-generated was performed to infer source contributions and frequency distributions (FD). It was found that nitrogen oxides, benzene and xylene were mostly emitted from motor vehicles; in contrast, industrial sources were a major contributor to sulfur and toluene pollution. Normal FD (NFD) described significantly SO2 in summer and NO2 and NOx in autumn (95% confidence interval); on the contrary, BTX presented a most peculiar FD rather different to the NFD. Lognormal distribution was often unacceptable. Predominant factors influencing FDs and its normality were found to be associated to those elements conditioning air pollutant diffusion: meteorology (wind speed and direction), relevant emission sources (especially for toluene), emission seasonality (mainly for SO2 and NOx), and photochemistry (mainly for NO2 and xylene).

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Accession: 012939281

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DOI: 10.1016/j.atmosenv.2006.05.056


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