Patterns of particle emission are different from those of the other pollutants included in the first phase of the EU Framework Directive because of their extreme diversity of origin and source, both primary and secondary, natural and anthropogenic, and there are significant differences in levels between Member States and regions within states. The limited amount of reliable PM10 data makes it difficult to establish a comprehensive overview of PM10 concentrations and trends in Member States. There is, therefore, a need to use detailed models which take dispersion, deposition and atmospheric chemistry into account. In turn, in order to assess the relative effectiveness and benefits of proposed.
