"At least 50 per cent of vehicle models produced from a particular plant shall be selected randomly from dealer's location or warehouse," the Ministry of Road Transport and Highways said in a notification.
The government said this will be done under a process known as conformity of production (COP).
Notifying Central Motor Vehicles (11th Amendment) Rules, 2016, the government has made provisions that testing agencies start collecting data on real-time emission of on-road vehicles from 2020, and from 2023 these norms will be applicable for COP.
The manufacturers were opposed to the new norms.
The government said the vehicles/ engines filled with bio diesel blends up to 7 per cent shall be tested with reference diesel (B7) and vehicles fuelled with Bio diesel blends above 7 per cent will be tested with respective blends.