Following the recent directive by the Supreme Court that banned the sales as well as registration of Bharat Stage-IV (BS-IV) vehicles across the country from April 1, 2020, auto companies are rushing to meet the deadline.
 
They are looking to advance the production of BS-VI vehicles and curtail making BS-IV models. Adopted in 2000, BS norms are auto emission guidelines based on the European emission standards.
 
Each stage places a certain limit on pollutants released, which is controlled by the type of fuel produced by oil companies. It also depends on upgradations and modifications made by automakers in vehicles to control pollutants such as NOx (nitrogen oxide) and particulate matter (PM).