1. Department of Physics and Atmospheric Science, Dalhousie University, 6310 Coburg Road, Halifax, Nova Scotia B3H 4R2, Canada
2. Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, 1 Brookings Drive, St. Louis, Missouri 63130, United States
3. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, United States
4. Southern Ontario Centre for Atmospheric Aerosol Research, University of Toronto, 200 College Street, Toronto, Ontario M5S 3E5, Canada
5. Dalla Lana School of Public Health, University of Toronto, 480 University Avenue, Toronto, Ontario M5G 1V2, Canada
6. Air Health Science Division, Health Canada, 269 Laurier Avenue West, Ottawa, Ontario K1A 0K0, Canada
7. Population Studies Division, Health Canada, 101 Tunney’s Pasture Dr., Ottawa, Ontario K1A 0K9, Canada
8. Department of Environmental Health Sciences, Yale School of Public Health, 60 College Street, New Haven, Connecticut 06520, United States
9. Department of Epidemiology, Biostatistics and Occupational Health, McGill University, 1020 Pine Avenue West, Montreal, Quebec H3A 1A2, Canada