1. Air Quality Processes Research Section, Environment and Climate Change Canada, Toronto, M3H 5T4, Canada
2. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
3. Norwegian Institute for Air Research (NILU), NO-2007 Kjeller, Norway
4. Swedish Environmental Research Institute (IVL), 411 33 Göteborg, Sweden
5. College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
6. Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, United Kingdom
7. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
8. National Laboratory for Environmental Testing (NLET), Canada Centre for Inland Waters, Environment and Climate Change Canada, Burlington, L7R 4A6, Canada
9. AirZone One Ltd., Mississauga, L4Z 1X1, Canada