Aerosol chemical speciation in Latin American urban sites: a comparative study of Lima, Medellin and São Paulo - Pereira, Guilherme Martins; Oraggio, Bruna; Kimmo, Teinïla; Custódio, Danilo; Hillamo, Risto; Alves, Célia; Vasconcellos, Pérola de Castro (World Chemistry Congress, 2017)