Order of the Supreme Court of India in the matter of M. C. Mehta Vs Union of India & Others dated 29/03/2017. The Apex Court in its Order noted that the seminal issue in these applications is whether the sale and registration and therefore the commercial interests of manufacturers and dealers of such vehicles that do not meet the Bharat Stage-IV emission standards as on 1st April, 2017 takes primacy "over the health hazard due to increased air pollution of millions of our country men and women." The controversy relates to the sale and registration (on and after 1st April, 2017) of such vehicles lying in stock with the manufacturers and dealers that meet the Bharat Stage III emission standards but do not meet the BS-IV emission standards.

Supreme Court in the M. C. Mehta Vs Union of India & Others case dated 29/03/2017 passed the following Order that says that "on and from 1st April, 2017 such vehicles that are not BS-IV compliant shall not be sold in India by any manufacturer or dealer, that is to say that such vehicles whether two wheeler, three wheeler, four wheeler or commercial vehicles will not be sold in India by any manufacturer or dealer on and from 1st April, 2017."