India will shift to Bharat Stage Six (BS VI) vehicular emission norms by April 1, 2020 from BS IV. The Supreme Court had ordered all car makers to shift to the cleaner BS VI norms, skipping BS V. The Central Pollution Control Board sets BS standards based on European emission norms. Since their introduction in 2000, BS norms for vehicular emission have got increasingly stringent.
BS VI-compliant fuel will be more refined than existing fuel: The amount of sulphur, a major pollutant, will reduce in 10 ppm (parts / million) from 50 PPM (BS IV). BS VI fuel will cut nitrogen oxide — major reason for respiratory diseases — by 70 per cent in diesel cars and 25 per cent in petrol engines. Cancer-causing PM 2.5 and PM 10 will also reduce by 80 per cent.
Following the norms will add on to the cost of cars — by at least Rs 1 lakh for diesel variants and Rs 25,000-50,0000 for the petrol ones. Fuel is also pegged to be costlier by up to Rs 2 a litre.