1. CIRES, University of Colorado/NOAA Chemical Sciences Laboratory, Boulder, US
2. Jülich Supercomputing Centre (JSC), Forschungszentrum Jülich, Jülich, DE
3. Atmospheric Watch & Geophysics – Research and Development Management, SMN, AR
4. Izaña Atmospheric Research Centre, AEMET, Santa Cruz de Tenerife, ES
5. Umweltbundesamt/Federal Environment Agency, AT
6. Climate Science Centre, CSIRO, Aspendale, Victoria, AU
7. Deutscher Wetterdienst, Hohenpeissenberg Meteorological Observatory, Hohenpeissenberg, DE
8. Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, CN
9. CIRES, University of Colorado/NOAA Global Monitoring Laboratory, Boulder, US
10. Laboratoire d’Aérologie, Université de Toulouse, CNRS, UPS, FR
11. Air Quality Research Division, Environment and Climate Change Canada, Toronto, Ontario, CA
12. NOAA Global Monitoring Laboratory, Boulder, Colorado, US
13. German Environment Agency, GAW Global Observatory Zugspitze/Hohenpeissenberg, Zugspitze, DE
14. Kislovodsk High Mountain Station of Obukhov Institute of Atmospheric Physics RAS, RU
15. Swedish Environmental Research Inst., Göteborg, SE
16. Norwegian Institute for Air Research, NILU, Kjeller, NO
17. School of Physics, National University of Ireland Galway, Galway, IE
18. Empa, Swiss Federal Laboratories for Materials Science and Technology, Duebendorf, CH
19. Environment and Climate Change Canada, 4905 Dufferin Street, Downsview, ON, M3H 5T4 CA
20. Key Laboratory for Atmospheric Chemistry, Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, CN