Emission factors of trace elements in urban tunnels in the Metropolitan Region of São Paulo, Brazil, and comparison with ambient PM2.5 and BC concentrations

Pedro Jose Perez-Martinez, UNICAMP State University of Campinas, Faculty of Civil Engineering, Campinas, Brazil, Regina Maura Miranda, University Sao Paulo, Sao Paulo, SP, Brazil, Maria de Fatima Andrade, University of Sao Paulo, Sao Paulo, SP, Brazil and Prashant Kumar Pr, Global Centre for Clean Air Research, Department of Civil & Environmental Engineering, University of Surrey, Surrey, United Kingdom
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