The SC will decide the plea of manufacturers to allow them to sell BS-III vehicles after March 31, 2017 only after examining the figures.
The Supreme Court on Monday asked motor vehicle manufacturers to give full details of the stock of pre-BSIV vehicles with them.
A bench headed by justice Madan B Lokur was hearing a plea filed by Bajaj Auto seeking to cease sales of BS-III vehicles from April 1, 2017.
The auto companies have been manufacturing BS-IV compliant passenger vehicles and commercial vehicles since 2010. Manufacturers are now clearing the existing stock of vehicles and offering their BS-III products at heavy discount.
Opposing the contention, SIAM said that the notification allows them to manufacture vehicles till March 31, and the ban should therefore not be made effective from April 1.
He added that the Indian auto industry has been the fastest in the world to upgrade its emission norms. Vishnu Mathur, director general, SIAM last week in an Economic Times report said, "Whenever there has been a change in emission norms, it has always been on the basis of date of manufacture".
The government had in August 2015 said the sale of four- wheelers not meeting Bharat Stage BS-IV emission norms will be barred in India from April, 2017 with a view to bringing the entire country under the ambit of tighter pollution control regime. The court had set April 1 as the deadline for stopping registration of such vehicles and switch on to BSIV whose toxic emissions are less than that of the old vehicles. While some manufacturers such as Bajaj Auto, Maruti Suzuki, Hyundai and other have converted all their vehicles to adhere to the BS IV norms, there are many others who have not done so completely and have a large inventory of vehicles which are still BS III.