Martinez D, de Nazelle A, Fruin S, Westerdahl D, Marshall J, Matamala J, Kubesch N, Ripoll A, Nieuwenhuijsen M. Relation between commuter and exposure to pollution related to traffic in Barcelona. Poster presented at the 23th Congress of International Society of Environmental Epidemiology (ISEE); September 15, 2011. Barcelona, Spain.