1. Faculty of Science, Institute for Atmospheric and Earth System Research (INAR)/Physics, University of Helsinki (UHEL), Helsinki, Finland
2. Science and Innovation Department, World Meteorological Organization (WMO), Geneva, Switzerland
3. Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
4. Climate System Research, Finnish Meteorological Institute (CSR-FMI), Helsinki, Finland
5. School of Engineering Sciences, Lappeenranta University of Technology, Lappeenranta, Finland
6. Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK
7. Biodiversity and Natural Resources Program, International Institute for Applied Systems Analysis (IIASA), Laxenburg, Austria
8. Department of Physics and Technology, UiT - The Arctic University of Norway, Tromso, Norway
9. Nansen Environmental and Remote Sensing Center (NERSC), Bergen, Norway
10. Atmospheric Composition, Finnish Meteorological Institute (AC-FMI), Helsinki, Finland
11. Norwegian Institute for Air Research (NILU), Kjeller, Norway
12. LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences (IAP-CAS), Beijing, China
13. Max Planck Institute for Chemistry (MPI-Chem), Mainz, Germany
14. Institute of Atmospheric Sciences and Climate, National Research Council of Italy (CNR-ISAC), Bologna, Italy
15. Institute of Geographic Sciences and Natural Resources Research (IGSNRR), Chinese Academy of Sciences (CAS), Beijing, China
16. Faculty of Science, Helsinki Institute of Sustainability Science (HELSUS), University of Helsinki (UHEL), Helsinki, Finland
17. Atmospheric Research Centre of Eastern Finland, Finnish Meteorological Institute (ARCEF-FMI), Kuopio, Finland
18. Institute of Atmospheric Physics, Chinese Academy of Sciences (IAP-CAS), Beijing, China
19. Department of Plant Physiology, Estonian University of Life Sciences (EULS), Institute of Agricultural and Environmental Sciences (IAES), Tartu, Estonia
20. Danish Meteorological Institute (DMI), Copenhagen, Denmark
21. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), Beijing, China
22. University of Chinese Academy of Sciences (UCAS), Beijing, China