Researchers at the Helmholtz-Zentrum Hereon have taken air measurements in the last year at various traffic-related locations in Hamburg and modeled this data for the entire city. The finding is that the pollution from ultrafine particles (UFP), which can have negative effects for health, is very high at selected places. Close to ferry terminals, concentrations as high as at busy roads were measured. The results of the study have been published in the scientific journal Toxics and can be transferred to other port cities.