1. Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, 00014 Helsinki, Finland.
2. Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
3. Finnish Meteorological Institute, 00560 Helsinki, Finland.
4. Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany.
5. Aerosol Physics Laboratory, Faculty of Engineering and Natural Sciences, Tampere University, 33720 Tampere, Finland.
6. Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, 116024 Dalian, China.
7. Department of Chemistry, University of Colorado Boulder, Boulder, CO 80309, USA.
8. Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309, USA.
9. Institute for Materials Chemistry, TU Wien, 1060 Vienna, Austria.
10. Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, CH-5232 Villigen, Switzerland.
11. Laboratory of Atmospheric Processes and their Impact, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.
12. School of Marine Sciences, Sun Yat-sen University, 519082 Zhuhai, China.
13. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
14. CENTRA and Faculdade de Ciências da Universidade de Lisboa, 1749-016 Lisboa, Portugal.
15. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 100084 Beijing, China.
16. Helsinki Institute of Physics, University of Helsinki, 00014 Helsinki, Finland.
17. Institute of Ion Physics and Applied Physics, University of Innsbruck, 6020 Innsbruck, Austria.
18. Climate and Atmosphere Research Centre (CARE-C), The Cyprus Institute, 1645 Nicosia, Cyprus.
19. Aerodyne Research, Inc., Billerica, MA 01821, USA.
20. Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
21. P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia.
22. Moscow Institute of Physics and Technology (National Research University),141701 Moscow, Russian Federation.
23. CERN, the European Organization for Nuclear Research, CH-1211 Geneva, Switzerland.
24. Department of Physics, University of Genoa, 16146 Genoa, Italy.
25. Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
26. Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO 80309, USA.
27. Natural Environment Research Council, British Antarctic Survey, CB3 0ET Cambridge, UK.
28. Department of Chemistry, University of Helsinki, 00014 Helsinki, Finland.
29. Department of Applied Physics, University of Eastern Finland, 70211 Kuopio, Finland.
30. Instituto Dom Luiz (IDL)–Universidade da Beira Interior, 6201-001 Covilhã, Portugal.
31. Faculty of Physics, University of Vienna, 1090 Wien, Austria.
32. Department of Engineering and Public Policy, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
33. Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, 210023 Nanjing, China.
34. Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, 100029 Beijing, China.