4. The Commission shall, with the technical assistance of the European Environment Agency, ensure the maintenance, regular update and continuous development, and an appropriate level of security, of the central Union database pursuant to paragraph 1 of this Article, taking into account the need for adjustments to any component to the standard as referred to in Article 3(1), the evolution of the technological state of the art in the transport sector, and any new methodological approaches for calculating greenhouse gas emissions. The Commission shall ensure the compatibility and consistency of the central Union database with existing Union legal acts.
Whenever default values for greenhouse gas emission factors contained in the central Union database are updated, the Commission shall, without undue delay, make the updated values publicly available. Transport and hub entities and data intermediaries shall use the latest available data to calculate and disclose their greenhouse gas emission information within 18 months of the date on which the update is made publicly available.
The obligation to use the updated default values referred to in the second subparagraph shall only apply to new output data to be calculated and disclosed after the update, without requiring the retroactive revision of information already published.