Johan Øvrevik,NIPH, Oslo, Norway. Primary and secondary particles from transport emissions. Role of chemical composition for toxicity of ultrafine particles

Meritxell Garcia-Marlès, EGAR – IDAEA-CSIC, Barcelona, Spain, Ultrafine Particles in Urban Europe: Phenomenology, Sources, Trends and Policy Implications

Armin Hansel, University of Innsbruck. Ultrafine particle exposure from individual aircrafts in Innsbruck