1. Air Quality Processes Research Section, Environment and Climate Change Canada, Toronto, Ontario M3H 5T4. Canada
2. Queensland Alliance for Environmental Health Sciences (QAEHS), The University of Queensland, Woolloongabba, Queensland 4102, Australia
3. Department of Civil and Environmental Engineering and IIHR-Hydroscience and Engineering, The University of Iowa, Iowa City, Iowa 52242, United States of America