This report presents a first evaluation of the reported exceedances of
the threshold value for information and warning of the public during summer 1998
(April-August). Information is not necessarily based on validated monitoring data and
hence the conclusions drawn should be considered preliminary.
Information on the occurrence of exceedances has been received from all EU Member
States for the months April, May, June, July and August. The quality of the exceedance
information supplied was good and largely according to EU specifications. Improvements can
be made for a number of countries as far as characterization of stations is concerned.
Some countries did not supply meta information on stations or supplied information on
observed exceedances only on paper. 1066 monitoring stations were assumed to be
operational this summer.
The threshold for warning of the public (1h > 360 µg/m3)
was exceeded on three days during summer 1998 in the Athens conurbation (2 and 3 July on 2
stations, 29 July on 1 station) and on 1 station on 7 August in France.
The threshold for information of the public (1h > 180 µg/m3)
has been exceeded in all Member States with the exception of Ireland, Denmark, Finland and
Sweden. The same countries did not report any exceedances last year. In other countries,
the number of days on which at least one exceedance was observed ranged from 7 in Belgium
to 74 in Spain. 61 % of all stations reported one or more exceedance. On average 3.9
exceedances occurred this year on stations which recorded at least one exceedance with an
average duration of 2.7 hours. The average maximum hourly concentration during an
exceedance of the threshold this year was 201 µg/m3.
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De Leeuw, F.,Tim de Paus (1998): Exceedance of EC Ozone Threshold values in Europe. Summary based on the information reported in the framework of the Council Directive 92/72/EEC on air pollution by Ozone. Report to the Commission by the European Environment Agency Topic Centre on Air Quality.
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