According to Anenberg et al. (2010), O3 caused 6% of the total mortality of

PM2.5 and O3 together in Europe, and 15.8% globally. However, this mortality depends on the local relative emission amounts; for example, according to Brandt et al. (2011), the health effect of all Danish emissions on acute deaths in Denmark was negative, because the high NOx emissions reduced domestic O3 concentrations. The total deposition of nitrogen to the Baltic Sea open water areas varied between 178 and 205 kt N, and the sulphur deposition from 77 to 101 kt S. The maximum N and S depositions were reached in BYL719 solubility dmso 2010, the minimum N deposition in 2009 and the minimum S deposition in 2011. The proportions of dry deposition were low in the northern SB431542 BS, increasing gradually southwards. There was a rather sharp dry

deposition gradient over the shorelines. The depositions had a high seasonal variation while in winter and late autumn when the sea is open, high turbulence mixes long-range transported upper concentrations effectively close to the surface, and dry deposition velocities are also high. Additionally, most of the storms occur during these same seasons with stronger precipitation and higher winds. However, the ship emission originated NOx deposition was highest during the summer due to the higher emissions and the faster chemistry converting compounds into scavengable species. Ship emissions occur near the surface, thus vertical mixing should not play as big a role as for long-range transported compounds. Ship emitted sulphur compounds are mostly in scavengable form, thus their seasonal deposition does not vary as much. The ship emission originated depositions fraction of the total NOx deposition to the BS varied during the 2008 to 2011 period from 12 to 14% while the respective contribution of sulphur deposition declined from 28% to 20% of the total modelled S deposition due to the sulphur directive

restrictions. Ship emissions contributed from 20 to 40% of the grid average NO2 concentration Chlormezanone and from 10 to 25% of the SO2 and SO4 concentrations along BS coasts. In the eastern BS, for example, ship originated SO4 concentrations fell to > 5% of the modelled total sulphate concentration within 10–100 km of the coast. In general, the proportion of ship emitted concentrations mostly fell quite sharply with distance from the coastline. The effect of the sulphur directive abatement of ships’ sulphur emissions can be deduced indirectly from the proportion of SO4 concentration in the whole PM2.5 mass in Europe. The chemical composition of particulate matter at six urban background sites in Europe was studied during 7-week field campaigns (Sillanpää et al. 2006). The mean concentrations of PM2.5 varied from 8.5 to 30 and from 5.4 to 29 μg m− 3 for PM2.5 − 10, PM2.