1. Department of Geography, Centre for Urban Health Initiatives, University of Toronto, 100 St. George Street, Toronto, Ontario, Canada M5S 3G3, Cantox Environmental Inc., 1900 Minnesota Court, Suite 130, Mississauga, Ontario, Canada L5N 3C9, Environment Canada, Meteorological Service of Canada, Air Quality Research Branch, 4905 Dufferin Street, Toronto, Ontario, Canada M3H 5T4, Risklogic Scientific Services Inc., 14 Clarendon Avenue, Ottawa, Ontario, Canada K1Y 0P2, Health Canada, Food Research Division,...