1. Inhalation Toxicology Laboratory, Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland
2. VTT Technical Research Centre of Finland, VTT, P.O. Box 1000, 02044, Espoo, Finland
3. Aerosol Physics Laboratory, Physics Unit, Tampere University, P.O. Box 692, 33014 Tampere, Finland
4. Department of Technical Physics, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland
5. Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland
6. Atmospheric Composition Research, Finnish Meteorological Institute, P.O. Box 503, Helsinki, 00101, Finland
7. Fine Particles and Aerosol Technology Laboratory, Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland