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

NASA Goddard Institute for Space Studies, New York, NY 10025, USA

TNO Built Environment and Geosciences, Princetonlaan 6, 3584 CB Utrecht, The Netherlands

Department of Environment, University of the Aegean, University Hill, 81100, Mytilene, Greece

Department of Environment, University of the Aegean, University Hill, 81100, Mytilene, Greece

Department of Environment, University of the Aegean, University Hill, 81100, Mytilene, Greece

Leibniz Institute for Tropospheric Research, 04318 Leipzig, Germany

School of Physics and Centre for Climate & Air Pollution Studies, National University of Ireland Galway, University Road, Galway, Ireland

School of Physics and Centre for Climate & Air Pollution Studies, National University of Ireland Galway, University Road, Galway, Ireland

now at: Institute for Environmental Assessment and Water Research (ID�A-CSIC), Barcelona, Spain

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

Department of Chemical Engineering, University of Patras, Patras, Greece

Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA