Compostos Orgânicos Voláteis: Principais Precursores de Ozônio na Cidade de São Paulo

Débora Souza Alvim, Luciana Vanni Gatti, Sergio Machado Correa, Angélica Pretto, Carlos de Souza Rossatti, João Paulo Orlando


The main air quality problems registered in the in the city of São Paulo are caused by ozone (O3) concentrations. This study, which was carried out in the Brazilian Basic Sanitation Engineering Company (CETESB) monitoring station of air quality located in the University of Sao Paulo - USP, focused on the elucidation of the main volatile organic compounds (VOCs) ozone precursors in São Paulo atmosphere between January to December 2006.

Seventy-eight samples of air were collected during the study period, which the ten most important compounds in the formation of O3 were but-1-ene (12%), propene (10%), ethylene (8%), p-xylene (7% ) buta-1,3-diene (6%), 1-ethyl-4-methylbenzene (4%), isoprene (4%), trans-but-2-ene (4%), 2-methyl-but-2-ene (4%) and cis-but-2-ene (3%). The most abundant classes concentration in the air were alkanes (45%), alkenes (26%), and aromatics (14%), aldehydes (13%) and alkadienes 2%.


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