Abstract
Air pollution by aerosol particles is mainly monitored as particulate matter concentrations like PM10 and PM2.5. However, mass-based measurements are hardly representative for ultrafine particles (UFP), which can only be monitored adequately in terms of particle number (PN) concentrations and are considered particularly harmful to human health. This study examines the total exposure to UFP in Hamburg city-centre and in particular, the impact of passenger ferryboats by modelling PN
concentrations and compares concentrations to measured values