1. What is Bharat Stage VI?
India will soon be at a par with Europe when it comes to emissions standards, when it adopts Bharat Stage VI. The country is taking this step, skipping from BS-IV to BS-VI, because India is a signatory to the Paris Climate Agreement, signed in October 2016.
Under Bharat Stage VI, cars, especially diesel cars will have to undergo significant changes to the engine to conform to the norms. Delhi already has Bharat Stage VI fuel on sale, in which the sulphur content of diesel is less than 10 mg/Kg, compared to 50 mg/Kg under Bharat Stage IV norms.
Reducing the sulphur content in fuel will directly reduce the particulate matter emissions (PM 10 and PM 2.5) of diesel vehicles. Sulphur is a by product of the fuel refining process.
Under the Bharat Stage VI norms the emissions requirements for petrol and diesel cars are almost at par. Diesel vehicles emit far less carbon di-oxide and hydrocarbons than petrol, while petrol cars emit less nitrous oxides and next to negligible particulate matter.