The supreme court had formerly announced that the BS-VI emission norms will be implemented by 2020 than the previously proposed 2024.
To upgrade a diesel car to a BS-VI emission norm compliant should cost the manufacturer Rs. 36,000, but will be producing cars that are 80 percent less polluting than the BS-IV compliant cars.
BS-V norm compliance would not have involved any improvement in engine technology, except the improvement in fuel atomization by increasing injector pressure to 1600-1900 bar.
Even if the cars were BS-V compliant, the upgrade to BS-VI would have cost the manufacture an additional cost of Rs. 20,280 for improving the injector pressure to 1800-2100 bar and fit diesel particulate filter.
Upgrading a BS-IV compliant petrol car to BS-VI emission compliant would cost only Rs. 1,200.