School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA

School of Earth and Atmospheric Science, Georgia Institute of Technology, Atlanta, GA, USA

Finnish Meteorological Institute, Helsinki, Finland

Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA

Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA

Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA

Department of Applied Physics, University of Eastern Finland, Kuopio, Finland

Atmospheric Chemistry Research Group, North-West University, Potchefstroom, South Africa

Department of Physics, University of Helsinki, Helsinki, Finland

Department of Physics, University of Helsinki, Helsinki, Finland

currently at: Institute for Energy and Climate Research, Forschungszentrum Jülich, Jülich, Germany

Department of Physics, University of Helsinki, Helsinki, Finland

Finnish Meteorological Institute, Helsinki, Finland

Department of Applied Physics, University of Eastern Finland, Kuopio, Finland

Department of Physics, University of Helsinki, Helsinki, Finland

Aerodyne Research Incorporated, Billerica, MA, USA

Finnish Meteorological Institute, Helsinki, Finland

Department of Applied Physics, University of Eastern Finland, Kuopio, Finland

Department of Applied Physics, University of Eastern Finland, Kuopio, Finland

National Center for Atmospheric Research, Boulder, CO, USA

School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA

School of Earth and Atmospheric Science, Georgia Institute of Technology, Atlanta, GA, USA

Institute of Chemical Engineering and High-Temperature Chemical Processes, Foundation for Research and Technology Hellas, Patras, Greece