Athanasios Katsoyiannis1, Alessandra Cincinelli2. 1. Norwegian Institute for Air Research (NILU) - FRAM High North Research Centre on Climate and the Environment, Hjalmar Johansens gt. 14, NO - 9296 Tromsø, Norway. Electronic address: athanasios.katsogiannis@gmail.com. 2. Department of Chemistry "Ugo Schiff", University of Florence, via della Lastruccia, 3, 50019 Sesto Fiorentino, Florence, Italy; Institute for the Dynamics of Environmental Processes, Italian National Research Council (IDPA-CNR), Dorsoduro 2137, 30123 Venice, Italy. Electronic address: acincinelli@unifi.it.