Traffic-related air pollution near roadways: discerning local impacts

Traffic-related air pollution near roadways: discerning local impacts 1 from background 2 Nathan Hilker, Jonathan M. Wang, Cheol-Heon Jeong, Robert M. Healy, Uwayemi Sofowote, Jerzy 3 Debosz, Yushan Su, Michael Noble, Anthony Munoz, Geoff Doerksen, Luc White, Céline Audette, 4 Dennis Herod, Jeffrey R. Brook, Greg J. Evans 5 Southern Ontario Centre for Atmospheric Aerosol Research, Department of Chemical Engineering and Applied Chemistry, 6 University of Toronto, Toronto, ON, M5S 3E5, Canada 7 Environmental Monitoring and Reporting Branch, Ontario Ministry of the Environment Conservation and Parks, Etobicoke, 8 ON, M3P 3V6, Canada 9 Air Quality Policy and Management Division, Metro Vancouver, Burnaby, BC, V5H 0C6, Canada 10 Air Quality Research Division, Environment and Climate Change Canada, Ottawa, ON, K1A 0H3, Canada 11 Air Quality Research Division, Environment and Climate Change Canada, Toronto, ON, M3H 5T4, Canada 12 Correspondence to: Greg J. Evans (greg.evans@utoronto.ca) 13