Federico Bianchi¹, Diego Aliaga², Qiaozhi Zha², Liine Heikkinen², Marcos Andrade³, Markku Tapio Kulmala² and Claudia Mohr⁴, (1)University of Helsinki, Helsinki, Finland, (2)University of Helsinki, Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, Helsinki, Finland, (3)Universidad Mayor de San Andrés, Laboratorio de Fisica de la Atmosfera, La Paz, Bolivia, (4)Stockholm University, Department of Environmental Science and Analytical Chemistry, Stockholm, Sweden