On June 29, 2022, the Ministry of Road Transport and Highways of India (MORTH) announced a draft regulation amending the emission standard BS-VI (Euro 6 equivalent) for vehicles manufactured after April 2023 and after April 2025, with regard to the emission standards for two- and three-wheeled vehicles under Article 115 (Emission of smoke and vapour, etc. from motor vehicles) of the Central Motor Vehicle Rules, 1989 and is soliciting opinions for 30 days. For two-wheeled vehicles, CO, THC and NOx emission standards are applied depending on the type of engine and the class in the World Motorcycle Test Cycle (WMTC). Emission standards for CO, NMHC, NOx, and PM have been established for all WMTC classes for two-wheeled vehicles manufactured after April 2025. Along with this, emissions-related monitoring items have been added for on-board fault diagnostic equipment (OBD).
The OBD functionality and revisions to the emission limit values for two-wheeled vehicles are as follows: