Based on a number of more recent epidemicological studies supported by toxicological evidence, WHO review (WHO, 2006) concluded that fine particles (PM2.5) are more hazardous in terms of cardiovascular and respiratory mortality. It was therefore recommended to also use PM2.5 as the indicator for health effects induced by particulate pollution (WHO Air Quality Guidelines, WHO, 2006). On the other hand, coarse particles may have more visible impacts on respiratory morbidity. However, current knowledge does not allow attributing the observed health effects to a particular characteristic of PM, nor precise quantification of the health effects of PM emissions from different sources or of individual PM components. Thus, current risk assessment practices should consider particles of different sizes, from different sources and with different compositions as equally hazardous to health (WHO, 2007)., The chemical transport models developed at Meteorological Synthesizing Centre - West (MSC-W) are concerned with the regional atmospheric dispersion and deposition of acidifying and eutrophying compounds (S, N), ground level ozone (O 3) and particulate matter (PM 2.5, PM 10)., EMEP MSC-W modelled air concentrations and depositions . The depositions of sulphur (S) and nitrogen (N), and air concentrations of ozone (O 3) and particulate matter (PM) available here are calculated with the EMEP MSC-W model as reported in the annual EMEP status reports..