A commission proposal for a Council Regulation on substances that deplete the ozone layer (COM(93) 202 of 3.8.1993) considers that, in the light of scientific evidence, it is appropriate in certain cases to introduce control measures more severe than those set out in the Second Amendment to the Montreal Protocol (the Copenhagen Amendment). This being the case, it is necessary for action to be taken at Community level in particular to control the production and supply within the Community of the ozone depleting substances methyl bromide and the hydrobromofluorocarbons, and to control the supply and use of hydrochlorofluorcarbons. The Commission considers that control of supply rather than demand is appropriate, given the market structure for these substances, by limiting sales and use by producers of their own production and by controlling the release into free circulation of imports. It is proposed that, after a period of reduced production of the listed substances (calculated in the case of each producer as a percentage of the production during 1986), that by specific dates stated in the proposal all production shall cease. The termination dates are 31 December 1993 and 31 December 1995, depending on the controlled substance. Further Articles in the proposal cover the control of supply, import licences, exportation, the recovery of used controlled substances, leakage, management and data reporting, and sanctions.