Participants
| Institute | Contact person | Instruments |
| BIRA-IASB | Michel Van Roozendael | MAX-DOAS, mini MAX-DOAS |
| CNRS | Florence Goutail | SAOZ, mobile SAOZ, micro SAOZ |
| EMPA | Dominik Brunner | TEI 42C in situ |
| GIST | Young Joon Kim | 2 mini MAX-DOAS |
| INTA | Olga Puentedura | 2 MAX-DOAS |
| IUP Bremen | Folkard Wittrock | MAX-DOAS insitu NO2 (bluelight conv) |
| IUP Heidelberg | Udo Frieß | 2 MAX-DOAS |
| JAMSTEC | Hitoshi Irie | MAX-DOAS |
| KNMI | Marc Allaart | NO2 sondes |
| KNMI | Tim Vlemmix | 2 mini MAX-DOAS |
| MPI, Mainz | Thomas Wagner | mini MAX-DOAS |
| NASA | Jay Herman | 2 Pandora Cleo |
| NERC, Cambridge | Howard Roscoe | mini MAX-DOAS |
| NIWA, Lauder | Karin Kreher | MAX-DOAS |
| RIVM | Arnoud Apituley | Aerosol and Tropospheric O3 lidar |
| RIVM | Rene van der Hoff | NO2 lidar |
| RIVM | Daan Swart | 2 in-situ NO2 (bluelight conv) |
| TNO | Bas Henzing | aerosol insitu |
| U. Leicester | Paul Monks | imaging DOAS |
| U. Toronto | Kimberly Strong | UV-VIS spectrometer |
| WSU | George Mount | MFDOAS aerosol lidar |
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