3. The Commission may, by means of implementing acts, establish a list of undertakings for which the use of ozone-depleting substances listed in Annex I as process agents in the processes referred to in Annex III in the installations referred to in paragraph 2 of this Article, is permitted, laying down the maximum quantities that may be used for make-up or for consumption as process agents and maximum emission levels for each of the undertakings concerned. Those implementing acts shall be adopted in accordance with the examination procedure referred to in Article 28(2).