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1. The Commission, supported by the Agency, and the Member States shall establish or maintain, as appropriate, in close cooperation, appropriate programmes and mechanisms, consistent with the state of the art, for the regular provision of comparable monitoring data on the presence of substances as listed in Part A of Annex III in the environment. When establishing or maintaining such programmes and mechanisms, due account shall be taken of developments under the Protocol and the Convention.

2. The Commission shall regularly assess the possible need for the mandatory monitoring of a substance listed in Part B of Annex III. In the light of such an assessment and any data made available to it by Member States, the Commission is empowered to adopt delegated acts in accordance with Article 18 to amend Annex III in order to move, where appropriate, a substance from Part B of Annex III to Part A thereof.