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
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.

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

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European Environment Agency (EEA)
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