Occurrence of polycyclic aromatic hydrocarbons in the São Paulo atmosphere: a comparative study - winter 2012/2013 - Caumo, Guilherme; Soares, Sandra; Caumo, Sofia Ellen da Silva; Maenhaut, Willy; Claeys, Magda; Vasconcellos, Pérola de Castro (Quadrennial ICACGP Symposium, 2014)