1.Member States shall take the measures necessary to ensure that measurements are taken at regular intervals of emissions into the air and of discharges of aqueous effluent from facilities to which the limit values provided for in Articles 4 and 5 apply.
2.For the purposes of checking compliance with the said limit values the sampling and analysis procedures and methods shall be in conformity with those described in the Annex or with any other procedure or method which gives equivalent results.
3.Member States shall notify to the Commission the procedures and methods they are using together with the information relevant to assess the pertinence of such procedures and methods. On the basis of this information, the Commission will keep under review the equivalence of the different procedures and methods and report to the Council five years after notification of the Directive.