Article 8 2.

current air quality, trends and projections up to and beyond 2015;

the scope for making further reductions in polluting emissions from all relevant sources, and the possible merit in introducing limit values aimed at reducing the risk to human health, for the pollutants listed in Annex I, taking account of technical feasibility and cost-effectiveness and any significant additional health and environmental protection that this would provide;

the relationships between pollutants and opportunities for combined strategies for improving Community air quality and related objectives;

current and future requirements for informing the public and for the exchange of information between Member States and Commission;

the experience acquired in the application of this Directive in Member States, and in particular the conditions under which measurement has been carried out as laid down in Annex III;

secondary economic benefits for the environment and health in reducing the emissions of arsenic, cadmium, mercury, nickel and polycyclic aromatic hydrocarbons to the extent that these can be assessed;

the adequacy of the particle size fraction used for sampling in view of general particulate matter measurement requirements;

the suitability of benzo(a)pyrene as a marker for the total carcinogenic activity of polycyclic aromatic hydrocarbons, having regard to predominantly gaseous forms of polycyclic aromatic hydrocarbons such as fluoranthene.