(2)in Article 23(3), point (c) is replaced by the following:‘(c)mathematical durability procedure:Until 31 December 2024, for each emission constituent, the product of the multiplication of the deterioration factor set out in Annex VII (B) and the environmental performance test result of a vehicle which has accumulated more than 100 km after it was first started at the end of the production line shall be lower than the environmental performance test limit set out in Annex VI (A).Notwithstanding the first subparagraph, for new types of vehicles from 1 January 2020 and for existing types of vehicles from 1 January 2021 until 31 December 2024, for each emission constituent the product of the multiplication of the deterioration factor set out in Annex VII (B) and the environmental performance test result of a vehicle which has accumulated more than 2500 km for a vehicle with a maximum design vehicle speed of < 130 km/h and 3500 km for a vehicle with a maximum design vehicle speed of ≥ 130 km/h after it was first started at the end of the production line shall be lower than the tailpipe emission limit set out in Annex VI (A).’;