Changes to Council Directive 84/533/EEC of 17 September 1984 on the approximation of the laws of the Member States relating to the permissible sound power level of compressors
EU Directive 1984/533
Made by Commission Directive 85/406/EEC of 11 July 1985 adapting to technical progress Council Directive 84/533/EEC on the approximation of the laws of the Member States relating to the permissible sound power level of compressors
From legislation.gov.uk's record of changes, the official one: see it there.