Aerosol Activity and Hygroscopicity Combined with Lidar Data in the Urban Atmosphere of Athens, Greece in the Frame of the HYGRA_CD CampaignAikaterini Bougiatioti, Alexandros Papayannis, Stergios Vratolis, Athina Argyrouli, Nikolaos Mihalopoulos, Maria Tsagkaraki, Athanasios Nenes and Konstantinos EleftheriadisEPJ Web of Conferences, 119 (2016) 15008DOI: https://doi.org/10.1051/epjconf/201611915008