1. European Commission; Institute for Environment and Sustainability, Joint Research Centre; Ispra; Italy
2. Swiss Federal Institute of Technology (EPFL); Lausanne; Switzerland
3. Atmospheric Chemistry Division; National Center of Atmospheric Research; Boulder; Colorado; USA
4. Netherlands Environmental Assessment Agency (RIVM); Bilthoven; Netherlands
5. Geophysical Fluid Dynamics Laboratory; NOAA; Princeton; New Jersey; USA
6. Laboratoire des Sciences du Climat et de l'Environnement; CEA/CNRS; Gif-sur-Yvette; France
7. Analytical and Environmental Chemistry Division; Indian Institute of Chemical Technology; Hyderabad; India
8. Max Planck Institute for Chemistry; Mainz; Germany
9. Laboratoire d'Aérologie; Observatoire Midi-Pyrénées; Toulouse; France
10. Max Planck Institute for Meteorology; Hamburg; Germany
11. NASA-Goddard Institute for Space Studies; New York; USA
12. School of Geosciences, Institute for Atmospheric and Environmental Science; University of Edinburgh; UK
13. Atmospheric Composition, Climate Research and Seismology Department; Royal Netherlands Meteorological Institute (KNMI); De Bilt; Netherlands
14. Atmospheric Science Division; Lawrence Livermore National Laboratory; Livermore; California; USA
15. International Institute for Applied Systems Analysis (IIASA); Laxenburg; Austria
16. Met Office; Exeter; UK
17. Department of Geosciences; University of Oslo; Oslo; Norway
18. Department of Environmental Sciences; University of Virginia; Charlottesville; Virginia; USA
19. Dipartimento di Fisica; Università L'Aquila; Aquila; Italy
20. Belgian Institute for Space Aeronomy; Brussels; Belgium
21. Goddard Earth Science and Technology Center (GEST); Baltimore; Maryland; USA
22. Atmospheric Composition Research Program; Frontier Research Center for Global Change (JAMSTEC); Yokohama; Japan