Article 3 — Common methodology for calculating the greenhouse gas emissions from transport services

1. The greenhouse gas emissions from transport services shall be calculated on the basis of the common methodology within the meaning of EN ISO 14083:2023 – Greenhouse gases – Quantification and reporting of greenhouse gas emissions arising from transport chain operations (the EN ISO standard), in its updated version, as specified in this Chapter. 2. No later than 3 December 2033, the Commission shall assess the need for an adjustment of any component of the EN ISO standard. 3. The Commission may, at its own initiative or upon request of a Member State, launch a compliance check to assess any amendment to the EN ISO standard. 4. By way of derogation from paragraph 1 of this Article, the Commission shall adopt delegated acts in accordance with Article 17 of this Regulation to supplement this Regulation by identifying amendments to the EN ISO standard or to any component thereof referred to in paragraph 2 of this Article which create a manifest risk of incompatibility with the objectives of this Regulation and other applicable Union law, in particular with Regulation (EU) 2021/1119, and which shall therefore not apply. 5. The Commission is empowered to adopt implementing acts to request the European Committee on Standardization to revise the EN ISO standard, based on the result of the assessment provided for in paragraph 2 of this Article and the compliance check provided for in paragraph 3 of this Article. Those implementing acts shall be adopted in accordance with the examination procedure referred to in Article 18(2). 6. The Commission is empowered to adopt implementing acts laying down detailed rules to clarify the common methodology referred to in paragraph 1 of this Article and to ensure its uniform implementation on the market as regards the approach for determining appropriate emission-relevant parameters for calculating greenhouse gas emissions before a transport service is provided, and, where applicable, laying down other technical parameters related to the allocation of greenhouse gas emissions or the aggregation of data elements that are not explicitly explained in that common methodology. Those implementing acts shall be adopted in accordance with the examination procedure referred to in Article 18(2).