Ozone levels during the summer of 2007 were among the lowest in the past decade.. The number and spatial extent of exceedances was lower than in any of the last ten summers. In contrast to the summer of 2006, no exceedances of the information threshold value (180 microgram/m3, Directive...

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...