Article 1 Objectives
1. A reciprocal exchange of information and data from networks and individual stations measuring ambient air pollution, hereinafter referred to as ‘reciprocal exchange’, is hereby established. It shall apply to: — networks and stations, covering detailed information describing the air-pollution monitoring networks and stations operating in the Member States, — measurements of air quality obtained from stations: the exchange covers data calculated in accordance with points 3 and 4 of Annex I from measurements of air pollution by stations in the Member States. 2. The Commission and the bodies referred to in Article 6 shall be responsible for the operation of the reciprocal exchange. In order to benefit from the experience acquired by the European Environment Agency and within its sphere of competence, the Commission shall call upon the Environmental Agency, inter alia as regards the operation and practical implementation of the information system.
Article 2 Pollutants
1. The reciprocal exchange shall cover the air pollutants listed in Annex I to the Directive on air quality. 2. Within the framework of the reciprocal exchange, the Member States shall also report on air pollutants listed in point 2 of Annex I to the extent that the relevant data are available to the bodies mentioned in Article 6 and are measured continuously by Member States.
Article 3 Stations
The reciprocal exchange, within the meaning of Article 1, covers stations: — which are used in the framework of the implementation of directives adopted in accordance with Article 4 of the Directive on air quality, — which, without being covered by the directives referred to in the first indent, will be selected for this purpose amongst existing stations at national level by the Member States in order to estimate local pollution levels for pollutants listed under point 2 of Annex I and regional (so called ‘background’) pollution levels for all pollutants listed in Annex I, — as far as possible, which took part in the reciprocal exchange of information established by Decision 82/459/EEC, provided that they are not covered by the second indent.
Article 4 Required information on networks and stations
1. The information to be communicated to the Commission shall concern the characteristics of the measurement stations, the measurement equipment and the operational procedures followed in those stations and the structure and organization of the network to which they belong. This information shall be transmitted unless it has been made available to the Commission within the existing legislation on air quality. The information required is specified on an indicative basis in Annex II. In accordance with the procedure laid down in Article 7, the Commission shall specify the minimum information which Member States shall transmit. 2. As regards stations referred to in the first indent of Article 3 the reciprocal exchange will apply once the legislation referred to in Article 4 of the Directive on air quality is in force. 3. Six months after the entry into force of this Decision at the latest, the Commission will make available to the Member States the existing data base containing the information already collected by its services on the subject, and software enabling it to be used and updated. The Member States shall correct, amend and/or supplement that information. The updated computer files shall be sent to the Commission during the second year following the entry into force of this Decision and by 1 October at the latest. This information will be accessible to the public via an information system set up by the European Environment Agency; it may also be supplied by the Agency or by the Member States upon request. 4. In accordance with the procedure laid down in Article 7, the Commission shall specify the technical procedures for the transfer of information, taking into account the provisions of Article 1 (2). 5. Following the first sending of information by the Member States, the Commission shall include the information transmitted in its data base and prepare each year a technical report on the information collected; it shall make available to the Member States the updated ‘networks-stations’ data base at the latest by 1 July. The Member States shall correct, amend and/or supplement that information. The updated computer files shall be sent to the Commission by 1 October at the latest.
Article 5 Information to be provided on data obtained by stations
1. The Commission shall be provided with the following results: (a) data as defined in points 3 and 4 of Annex I for those stations referred to in the first indent of Article 3 and selected according to criteria specified in directives adopted in accordance with Article 4 of the Directive on air quality; account shall be taken of the various conditions of air quality in each Member State for the selection of those stations; (b) at least annual data as defined in point 4 of Annex I for all the other stations referred to in the second indent of Article 3; (c) data as defined in points 3 and 4 of Annex I for all the stations referred to in the third indent of Article 3. These data shall be transmitted unless they have been made available to the Commission under the existing legislation on air quality. 2. The Member States shall be responsible for validating the data transmitted or used to calculate the values transmitted in accordance with the general rules set out in Annex III. Any aggregation of data and the calculation of statistics by a Member State shall comply with criteria at least as stringent as those indicated in Annex IV. 3. The Member States shall transmit the results for the calendar year by 1 October of the following year at the latest; the first transfer shall cover the calendar year 1997. 4. As fas as possible, the Member States shall transmit to the Commission the information collected from 1 October 1989 to the date of entry into force of this Decision by the stations which took part in the reciprocal exchange of information established by Decision 82/459/EEC. 5. In accordance with the procedure laid down in Article 7, the Commission shall specify the technical procedures for the transfer of results, taking into account the provisions of Article 1 (2). 6. The Commission shall include the data transmitted in its data base and prepare each year a technical report on the information collected and shall make available to the Member States the updated ‘results’ data base. The information will be accessible to the public via an information system set up by the European Environment Agency; it may also be supplied by the Agency upon request. The information, whether accessible, supplied or included in the report, will be based only on validated data. 7. The Commission shall prepare a general report for the public, summarizing the collected data and outlining the underlying trends in air quality in the European Union. 8. In agreement with the Member States, the Commission shall ensure the transfer to international bodies of selected data needed for the purposes of various international programmes.
Article 6 
Each Member State shall designate one or several bodies responsible for the implementation and operation of the reciprocal exchange and shall forthwith inform the Commission thereof.
Article 7 
In accordance with the procedure laid down in Article 12 of the Directive on air quality, the Commission shall specify, where appropriate: — the preparation and updating of procedures concerning the transfer of data and information, — liaison with the activities undertaken by the European Environment Agency in the field of air pollution,
Article 8 
No later than the end of a five-year period following the entry into force of this Decision, the Commission shall submit to the Council a report on its implementation. This report shall be accompanied by any proposal the Commission deems appropriate to amend this Decision.
Article 9 
This Decision shall apply with effect from 1 January 1997.
Article 10 
This Decision is addressed to the Member States.