Measured reduction of kerbside ultrafine particle number concentrations in Copenhagen

摘要

The average particle number concentration kerbside at a busy street in Copenhagen has been reduced by 27% from the period 2002-2004 to the period 2005-2007. The reduction is in the ultrafine particle range (<100 nm). Strong evidence indicates that a significant part of the reduction, especially in the size range <30 nm, is due to the transition to sulphur-free (<10 ppm) diesel fuel and petrol in Denmark at New Year 2005.