Measuring atmospheric composition change

P Laj, J Klausen, M Bilde, C Plass-Duelmer, G Pappalardo, C Clerbaux, U Baltensperger, J Hjorth, D Simpson, S Reimann, PF Coheur, A Richter, M De Maziere, Y Rudich, G McFiggans, Kjetil Tørseth, A Wiedensohler, S Morin, M Schulz, JD Allan, JL Attie, I Barnes, W Birmili, JP Cammas, J Dommen, HP Dorn, D Fowler, S Fuzzi, M Glasius, C Granier, M Hermann, Ivar S A Isaksen, S Kinne, I Koren, F Madonna, M Maione, A Massling, O Moehler, L Mona, PS Monks, D Muller, T Muller, J Orphal, VH Peuch, F Stratmann, D Tanre, G Tyndall, AA Riziq, M Van Roozendael, P Villani, B Wehner, H Wex, AA Zardini