1. Institute of Ecology, University of Innsbruck, Sternwartestr. 15, 6020 Innsbruck, Austria
2. Ionicon Analytik GmbH, Eduard‐Bodem‐Gasse 3, 6020 Innsbruck, Austria
3. Key Laboratory for Atmospheric Chemistry, Centre for Atmosphere Watch & Services, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Zhongguancun Nandajie 46, Beijing 100081, China
4. Institute for Atmospheric and Environmental Sciences, J.W. Goethe University, Altenhöferallee 1, 60438 Frankfurt am Main, Germany
5. Institute of Ion Physics and Applied Physics, University of Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria
6. Institute for the Protection of Plants, National Research Council, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy