JUDGMENT

Deepak Gupta, J.

1. The seminal issue to be decided is whether Bharat Stage IV (for short BS-IV) compliant vehicles should be permitted to be sold in India after 31.03.2020.

2. In an earlier judgment dated 13.04.2017, we have given detailed reasons for the order dated 29.03.2017 whereby this Court had directed that on and from 01.04.2017, vehicles which are not BS-IV compliant, shall not be sold by any manufacturer or dealer or motor vehicle company whether such vehicle is a two wheeler, three wheeler, four wheeler or commercial vehicle etc.. We had also by the said order prohibited registration of non-BS-IV vehicles from 01.04.2017 except if such vehicles were sold on or before 31.03.2017. Since in the judgment dated 13.04.2017, we have set out in detail the history leading to implementation of the Bharat Stage compliant fuels, it is not necessary to repeat the same here. However, a short recap of the same would be apposite to understand the issues in hand.

3. In 2003, the Government of India announced the National Auto Policy based on the recommendations of the Mashelkar Committee constituted in 2001. BS-IV compliant vehicles were made compulsory for four wheelers in dif