Commission Delegated Regulation (EU) 2023/2904 of 25 October 2023 amending Delegated Regulation (EU) 2019/1122 supplementing Directive 2003/87/EC of the European Parliament and of the Council as regards the functioning of the Union Registry Basic information CELEX number: 32023R2904Official Journal: L_202302904 Form: Regulation Procedure number: --Languages: bg cs da de el en et fi fr ga hr hu it lv lt mt nl pl pt ro sk sl es sv Dates Date of document: Date of publication: Date of effect: December 30, 2023 Entry into force - Date pub. +1 See Art 2 January 1, 2025 Application - Partial application See Art 2 January 1, 2027 Application - Partial application See Art 2 Modified by Modifies Modifies: Affected by case Legal basis EuroVoc Vocabulary Fuel Annex 4 Provisions of Union law referred to in Article 9 Air transport Greenhouse gas Reduction of gas emissions Environment Tradeable emission permit EU environmental policy Maritime transport Information system Motor fuel EU emission allowance EU Emissions Trading Scheme Monitoring of atmospheric pollution