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Figure

Change in number of ozone exceedance days between 1993-1996 and 2000-2004

Figure Created 12 Nov 2009 Published 12 Nov 2009 Last modified 28 Mar 2022

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The map shows the change in the average number of ozone exceedence days from April to September observed at regional background stations (EMEP monitoring stations) from the period 1990-1994 to the period 1999-2004, excluding the abnormally warm summer of 2003. A day is counted as an exceedence day when the daily maximal 8-hr-average ozone concentration exceeds 60 ppbV.