25a - Risk assessment of diesel engine exhaust emissions

As diesel engine exhaust emissions (DEEES) are a complex mixture of substances there has been little formal agreement on how exposures to them should be assessed. Several different monitoring and analysis methods have been developed, many relying on using a constituent of the exhaust emission as a surrogate or concentrating on either the particulate fraction or gaseous fraction only. In practice this means that results across monitoring surveys cannot be reliably correlated. This work is to propose a standard reference methodology for risk-based health assessments.