The use of test fuels is permitted for certification testing of gaseous and particulate pollutants and power/smoke testing in Europe. However, other countries that have adopted and referenced UN R24 may not allow this. This proposal would permit the use of the same test fuel in cases where the testing for emission of gaseous and particulate pollutants is conducted at the same time as the testing under UN R24.

Proposal to align UN R24 with to align the UN R85 and ISO 1585:2020.

Proposal from GRPE to exempt vehicles with newer technologies (e.g., modern vehicles) from opacity tests.

Proposal to clarify the scope and application of the regulation.

Proposes to amend the scope to clarify that UN R 49-06 series engine certification (corresponding to Euro VI) have no smoke and does not include the certification according to UN Regulation 24.