Air quality of an urban school in São Paulo city
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A major campaign was carried out in indoor and outdoor environments in a school located in the university campus of the city of São Paulo. Elements, PAH, oxy-PAH, water-soluble ions and black carbon were determined and compared with preliminary campaigns. The results indicated that the concentrations of particles and organic compounds were higher indoors. Some high molecular weight compounds, attributed to vehicular emissions, were more abundant outdoors. The associated health risk was found to be low. 2-Methylanthraquinone and benzo(a)anthracene-7,12-dione were detected in the indoor samples, denoting the infiltration of vehicle exhaust. The observation of black carbon also corroborates the contribution of traffic emissions. For most of the elements, except for chromium, iron and manganese, the concentrations obtained in indoors were higher than outdoors, mainly due to soil resuspension. Chromium and manganese likely derived from emissions of the vehicle powered by mixtures of ethanol and gasoline. Water-soluble inorganic ions species denoted the influence of soil resuspension and human activities.
KeywordsIndoor pollution PM10 PAH oxy-PAH Inorganic species in air
The Group on Atmospheric Chemistry Studies thank the support of INCT-Energy and Environment
This study is financially supported by CESAM (UID/AMB/50017-POCI-01-0145-FEDER-007638) and FCT/MCTES through national funds (PIDDAC) and co-funded by the FEDER, within the PT2020 Partnership Agreement and Compete 2020.
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