Changes made by Council Directive 2006/105/EC of 20 November 2006 adapting Directives 79/409/EEC, 92/43/EEC, 97/68/EC, 2001/80/EC and 2001/81/EC in the field of environment, by reason of the accession of Bulgaria and Romania
EU Directive 2006/105
Made to Directive 2001/81/EC of the European Parliament and of the Council of 23 October 2001 on national emission ceilings for certain atmospheric pollutants
From legislation.gov.uk's record of changes, the official one: see it there.