since 2010
Member of the Adolf-Martens-Award Committee
since 2008
Editor of "Aerosol and Air Quality Research" (AAQR)
since 2007
Member of the Smoluchowski Award Committee of GAeF (Gesellschaft für Aerosolforschung)
2002 - 2009
Associate Editor of the Journal of Geophysical Research - Atmospheres (JGR)
http://www.agu.org/journals/jd/
2001 - 2009
Member of the editorial board of Atmospheric Chemistry and Physics, an interactive scientific journal (European Geophysical Society)
http://www.copernicus.org/EGU/acp/
GEOPHYSICAL SOCIETY, GENERAL ASSEMBLY
Co-convener (zusammen mit C. George, M. Ammann):
Tropospheric aerosols: formation and heterogeneous chemistry
Member of the expert team "World Calibration/Instrument Intercomparison Facility for VOC" for the WMO "Global Atmospheric Watch" Programm