From Thursday (April 1), petrol and diesel prices will go up in 13 cities, including the four metros, where stricter Bharat Stage-IV emissions norms will be implemented, requiring the sale of upgraded and less polluting fuel.

The retail price of petrol will go up by around 50 paise and that of diesel by 26 paise (depending upon the prevailing price and tax structure in various States).

The 13 cities that will follow BS-IV emissions norms from April 1 are Delhi, Mumbai, Kolkata, Chennai, Hyderabad, Bangalore, Lucknow, Kanpur, Agra, Surat, Ahmedabad, Pune and Sholapur. In Delhi, all the three oil marketing companies (OMCs) — Indian Oil, Hindustan Petroleum and Bharat Petroleum — will start selling cleaner BS-IV (equivalent to Euro-IV) low-sulphur auto fuels from April 1. The petrol price in Delhi will go up by 50 paise per litre to Rs.47.93 a litre and diesel rates will rise by 26 paise to Rs.38.10 a litre.

Similarly, the rest of the country will switch from BS-II to BS-III, starting from Goa on Thursday. It would take around six months before the entire country is covered under BS-III norms. BS-III petrol will be costlier by over 26 paise per litre and diesel by 21 paise per litre (varying from State to State).

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