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

Figure Created 12 Nov 2009 Published 12 Nov 2009 Last modified 08 Jun 2017
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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.


Additional information

Ozone exceedance days meaning days where the maximal 8 hr average ozone concentration exceeds 120 micrograms per m³ (year 2003 excluded).


Geographic coverage

Temporal coverage

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