This report gives an overview of reported ground-level ozone concentrations between April and September 2008, and provides a comparison with the last ten years.

Ozone levels during summer 2009 were as low as during summer 2008 and according to several indicators were among the lowest since reporting of Europe-wide data commenced in 1997. In contrast to previous summers, in 2009 there were no pan-European multi-day episodes. Summer 2009 was characterised...