1. Laboratory of Atmospheric ChemistryPaul Scherrer Institute Villigen Switzerland
2. Institute for Aerosol and Sensor TechnologyUniversity of Applied Sciences Northwestern Switzerland Windisch Switzerland
3. Laboratory for Air Pollution/Environmental TechnologySwiss Federal Laboratories for Materials Science and Technology (Empa) Dübendorf Switzerland
4. Federal Office of Meteorology and Climatology (MeteoSwiss) Payerne Switzerland
5. Department of Environmental SciencesUniversity of Basel Basel Switzerland
6. Now at Grolimund + Partner AG–environmental engineering Bern Switzerland