| National Technical University of Athens, Department of Physics, Greece |
| University of Bern, Institute for Applied Physics, IAP |
| BIRA-IASB, Belgium |
| Bruker Optics Inc., Karlsruhe |
| University of Bremen, Institute for Environmental Physics, IEP |
| JPL-Caltech, Pasadena |
| CNRS-LPMA, Paris, France |
| CNRS, Service d´Aéronomie, Paris, France |
| DLR-DFD, Wessling |
| Geoforschungszentrum Potsdam, Geodäsie und Fernerkundung |
| University of Heidelberg, Institut for Environmental Physics, IUP |
| Forschungszentrum Jülich, ICG-I |
| Forschungszentrum Jülich, ICG-II |
| KNMI, Chemistry and Climate Division, The Netherlands |
| Rheinisches Institut für Umweltforschung, University of Cologne |
| University of Liege, Belgium |
| Medizinisches Laserzentrum Lübeck GmbH (MLL) |
| Max-Planck-Institute of Meteorology, Hamburg |
| NILU, Kjeller, Norway |
| NOAA, Boulder, Colorado, USA |
| NIWA, Lauder, New Zealand |
| Institute for Tropospheric Research, Leipzig, Germany |
| Aristotle University of Thessaloniki, Laboratory for Atmospheric Physics, Greece |
| South African Weather Service |
| WMO/GAW Training & Education Center |
