report no. 9/13

21 Oct 2013

This report summarises how light might interact with Polycyclic AromaticHydrocarbons (PAHs) to alter both their environmental fate and their potential tocause adverse effects. The quantification of these changes is complicated due to thedifficulties in measuring these changes in the laboratory and subsequently, in relatingthese to how PAHs behave in the real environment. The consequences of attemptingto account for these interactions within the framework of a generic environmental riskassessment are discussed and the conclusion reached that the impact of light on thebehaviour of PAHs is best accounted for using a site-specific rather than a genericregional or generic local petroleum product risk assessment. The key elements ofsuch an approach are described.