1. Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario M5S3E5, Canada
2. Environmental Monitoring and Reporting Branch, Ontario Ministry day) of the Environment and Climate Change, Etobicoke, Ontario M9P3V6, Canada
3. Air Quality and Climate Change, Metro Vancouver, Burnaby, British Columbia V5H4G8, Canada
4. Air Quality Research Division, Environment and Climate Change Canada, Ottawa, Ontario K1A0H3, Canada