potential impact, which would be likely to cause significant changes in long-range transboundary air pollution; (c) control technologies for reducing air pollution relevant to long-range transboundary air pollution; (d) the projected cost of the emission control of sulphur compounds and other major air pollutants on a national scale; (e) metereological and physico-chemical data relating to the processes during transmission; (f) physico-chemical and biological data relating to the effects of long-range transboundary air pollution and the extent of the damage (1) which these data indicate can be attributed to long-range transboundary air pollution; (g) national, sub-regional and regional policies and strategies for the control of sulphur compounds and other major air pollutants. Implementation and further development of the cooperative programme for the monitoring and evaluation of the long-range transmission of air pollutants in Europe Article 9 The Contracting Parties stress the need for the implementation of the existing "cooperative programme for the monitoring and evaluation of the long-range transmission of air pollutants in Europe" (hereinafter referred to as EMEP) and, with regard to the further development of this programme, agree to emphasize: (a) the desirability of Contracting Parties joining in and fully implementing EMEP which, as a first step, is based on the monitoring of sulphur dioxide and related substances; (b) the need to use comparable or standardized procedures for monitoring whenever possible; (c) the desirability of basing the monitoring programme on the framework of both national and international programmes. The establishment of monitoring stations and the collection of data shall be carried out under the national jurisdiction of the country in which the monitoring stations are located; (d) the desirability of establishing a framework for a cooperative environmental monitoring programme, based on and taking into account present and future national, sub-regional, regional and other international programmes; (e) the need to exchange data on emissions at periods of time to be agreed upon, of agreed air pollutants, starting with sulphur dioxide, coming from grid-units of agreed size ; or on the fluxes of agreed air pollutants, starting with sulphur dioxide, across national borders, at distances and at periods of time to be agreed upon. The method, including the model, used to determine the fluxes, as well as the method, including the model, used to determine the transmission of air pollutants based on the emissions per grid-unit, shall be made available and periodically reviewed, in order to improve the methods and the models; (f) their willingness to continue the exchange and periodic updating of national data on total emissions of agreed air pollutants, starting with sulphur dioxide; (g) the need to provide meteorological and physico-chemical data relating to processes during transmission; (h) the need to monitor chemical components in other media such as water, soil and vegetation, as well as a similar monitoring programme to record effects on health and environment; (i) the desirability of extending the national EMEP networks to make them operational for control and surveillance purposes. Executive Body Article 10 1. The representatives of the Contracting Parties shall, within the framework of the Senior Advisers to Economic Commission for Europe Governments on Environmental Problems, constitute the Executive Body of the present Convention, and shall meet at least annually in that capacity. 2. The Executive Body shall: (a) review the implementation of the present Convention; (1) The present Convention does not contain a rule on State liability as to damage. (b) establish, as appropriate, working groups to consider matters related to the implementation and development of the present Convention and to this end to prepare appropriate studies and other documentation and to submit recommendations to be considered by the Executive Body; (c) fulfil such other functions as may be appropriate under the provisions of the present Convention. 3. The Executive Body shall utilize the Steering Body for the EMEP to play an integral part in the operation of the present Convention, in particular with regard to data collection and scientific cooperation. 4. The Executive Body, in discharging its functions, shall, when it seems appropriate, also make use of information from other relevant international organizations. Secretariat Article 11 The Executive Secretary of the Economic Commission for Europe shall carry out, for the Executive Body, the following secretariat functions: (a) to convene and prepare the meetings of the