3. Economic operators, EU carriers and authorised representatives shall notify the competent authorities referred to in paragraph 2 of any significant change in what was previously notified in accordance with paragraph 2 regarding the concerned installations and activities related to handling and transporting plastic pellets, including any closure of an existing installation, cessation of transport activities or where they are no longer subject to this Regulation, and any changes in the quantities of plastic pellets handled that are relevant for the application of the obligations associated with the thresholds.