BS-IV fuels contain 50 parts per million (ppm) sulphur, while BS-V and BS-VI grade fuel will have 10 ppm sulphur.
The government of India has announced that Petroleum Ministry in consultations with public oil marketing companies (OMCs) have chose to prepone retailing BS-VI auto grade fuels from April, 1,2018 in Delhi.
In fact, the Government in consultation with stakeholders had made a decision to meet worldwide standards, and skip the BS-V grade, and go straight to BS-VI, which will come into force on April 1, 2017.
"This (new) measure is expected to help mitigate the problem of air pollution in NCT (National Capital Territory) of Delhi and surrounding areas", it said in a statement.
To be sure the government has not asked the automotive industry or its apex lobby body the Society of Indian Automobile Manufacturers (SIAM) to advance the roll-out BS-VI compliant vehicles to April 1, 2018. Objections from the National Green Tribunal scuttled the move. Delhi also accounts for 3 percent of India's two-wheeler sales and 11 percent of north India's two-wheeler sales. That grade is equivalent to Europe's Euro-6 fuel emissions standard, the report added.
According to the Centre for Science and Environment, the move to Bharat Stage-VI will bring down Nitrogen Oxide emissions from diesel cars by 68 per cent and 25 per cent from petrol engined cars. These vehicles will be much cleaner than today's generation engines. The OMCs are making huge investments to upgrade fuel projects for producing the BS-VI grade fuels.
Only foreign manufacturers such as Renault, Mercedes, BMW, Audi, Volkswagen, Volvo, MAN, Scania, Daimler Trucks to name a few sell BS-VI-ready vehicles in the western markets would be able to launch them in India because of ready availability of technology.