The Common Market has agreed to cut its use of chlorofluorocarbons, the synthetic compounds that destroy the Earth's ozone layer, by 85 percent and seek a total ban on its production by the end of the century.

Environmental officials meeting in Brussels agreed Thursday to give the 12 EEC member nations a mandate to completely phase out the manufacture and use of the compounds by the year 2000.The EEC member states are responsible for about half the world's annual chlorofluorocarbon production of 1 million tons.

Several countries, including the United States, have banned use of the compounds in aerosol propellants, and Prime Minister Margaret Thatcher said Thursday that Britain will soon require all new refrigerators to contain substances that will not harm the ozone layer.