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You are here: Home / Environmental topics / Air pollution / Air quality levels in Europe / Ozone summer / Official summer ozone statistics

Official summer ozone statistics

Overview of official monthly data during the summer

EU Member States are required by Directive 2008/50/EC to report exceedances of the information threshold and alert threshold values (one-hour concentrations higher than 180 and 240 µg.m-3) to the Commission before the end of the month following an occurrence. Furthermore, by 31 October EU Member States must provide additional information for the summer period. This should include data on exceedances of the long-term objective for the protection of human health (daily maximum 8-hour average concentrations of 120 µg.m-3).

The summary report as required by Directive 2008/50/EC is prepared after each summer season. The report contains of detailed description of the ozone levels during the summer season and is published as EEA Technical report.


Overview of monthly deliveries in the summer 2013

Following table shows a summary on observed ozone exceedances per country and the whole of Europe. The list of countries consists of EEA member and collaborating countries (EU Member States are in the first part of the table).

The information is partly based on non-validated monitoring data and hence should be regarded as preliminary
(last update 2. 12. 2013, based on data received before 2. 12. 2013).

Overview of monthly deliveries


Rules for monthly data reporting

On 14 June 2008, the Directive 2008/50/EC on ambient air quality and cleaner air for Europe came into force. The new directive does not change the levels of the existing targer values (TV), lonr-term objectives (LTOs), alert threshold or information threshold for ozone set in Directive 2002/3/EC relating to ozone in ambient air.

However, the 'transmission of information and reports' of Article 10 of Directive 2002/3/EC has remained in force. This article addresses the reporting requirements concerning ambient ozone. The article will be repealed two years after entry into force of the upcoming implementing measures of Directive 2008/50/EC. The countries use unified rules for monthly data reporting. The data reports as submitted by countries are available on Central Data Repository (CDR).

The European Topic Centre for Air Pollution and Climate Change Mitigation (ETC/ACM) prepares overview of monthly deliveries in the current summer.

The exchange of monthly and summer reports should make use of the following guidelines and formats.


Templates for reporting

A Reportnet Generic Data Exchange Module (GDEM) was introduced in 2005 to facilitate the delivery and validation of ozone exceedance data. Countries should select the most convenient delivery option:

  1. insert data on-line into the reporting form web questionnaires available when the envelope is created in CDR. The data is converted automatically to XML for quality testing and further processing. This option is convenient when the volume of information to report is small or for confirming that no exceedances occurred during the month
  2. provide data in the prepared Excel reporting form templates and upload them to CDR as usual. The data is converted to XML in CDR for quality testing and further processing.
  • CCYYM01.xls ... Excel template to report monthly exceedances
  • CCYY001.xls ... Excel template to report summer season exceedances
  1. provide data directly in XML format according to the published schema and upload to CDR as usual
  • CCYYM01.xml ... XML schema to report monthly exceedances
  • CCYY001.xml ... XML schema to report summer season exceedances



The detailed definition of the data to be reported can be downloaded from the Reportnet Data Dictionary:


File naming conventions

The following structure for naming files is suggested in order to avoid duplication and to allow a more efficient management of data files: CCYYMRR, where

  • CC is the country code (ISO 3166 alpha 2 code)
  • YY is the year (09 for 2009)
  • M is the month (April =4, …., September =9). M=0 for the summer report.
  • RR is the version number (01 is the initial delivery, 02 is the first revision)


  • GB07002 ... file from the UK containing the revised summer report
  • DE07401 ... file from Germany with the exceedances observed in April 2007
  • FR070703 ... file from France with the second update of exceedances observed in July 2007


Station meta-information

Particular attention should be paid to the station meta-information, which has been requested. The correct information on station type and location is essential for proper summer ozone data analysis, preparation of maps and tables in the annual report on exceedances of ozone threshold values.

In order to assist countries in the task of correct and complete delivery of station meta-information, the ETC/ACC and EEA has prepared the list of stations and connected information already registered in Airbase (XML file).

In the monthly and summer ozone data reporting an unambiguous link between the ozone monitoring station and the station registered in Airbase should be given. The best way is to apply the unique station code used under the Exchange of Information (EoI) Decision. For stations, which are not yet registered in AIRBASE, the separate station-information form should be completed within monthly reporting.


Quality feedback

The Reportnet Generic Data Exchange Module (GDEM) will post a quality report directly in the delivery envelope. The checks made by the GDEM are based on the quality rules stored in the Reportnet Data Dictionary. This report will be ready within a few minutes of the data delivery.

Additional feedback may also be provided at a later date to national experts by European Topic Centre for Air Pollution and Climate Change Mitigation (ETC/ACM).

When amending previously submitted information countries are requested to resubmit the complete file following the naming conventions.



Technical assistance regarding specific details of the data request is provided by ETC/ACC:

Libor Cernikovsky


Phone: +420 596 900 218

Fax: +420 596 910 284

Support and assistance for access permission to CDR and with delivering data in CDR are available from Eionet helpdesk at

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