The auto emission norms were introduced in India in 2000, when the Bharat Stage norms were accepted by the then government, based upon the European emission norms. These norms were adopted by the Indian government to check the air pollutants released from any internal combustion engine of any equipment or vehicle.
Since 2000, India started following European emission and fuel regulations for four-wheeler heavy duty and light duty vehicle. India’s own emission regulations are implemented on two and three wheeled vehicles.
Each stage of the emission norms represents a specific limit on the pollutants released, which is controlled by the type of fuel made by the companies and the up-gradations and modifications made by the auto firms to the vehicle to control pollution.
India has invoked Bharat Stage III norms over the country from 2010 October. Bharat Stage IV emission norms were enforced in 13 major cities in India from April 2010.
At present, BS-IV diesel and petrol are being supplied in Northern part of India including Jammu and Kashmir, Himachal, Punjab, Uttrakhand, Haryana, Delhi and some parts of Rajasthan and Western Uttar Pradesh. The rest of the Nation has BS-III grade fuel.
States like Goa, Telangana, Odissa, Kerala, Karnataka and Union Territories of Daman and Diu, Andaman and Nicobar Island and Dadra-Nagar-Haveli will be receiving BS-IV fuel. The rest of the nation is expected to get supplies of BS-IV grade fuel from 1st of April, 2017.
A report of the Standing Committee on Petroleum and Natural Gas tabled in Parliament in May said that “The Oil Ministry is considering a proposal to switch over directly from BS-IV to BS-VI auto fuels by April 1, 2020 instead of step-wise up-gradations from BS-IV to BS-V and then BS-V to BS-VI."
BS-VI was on the other hand expected to be introduced in 2024.