Three more cities are switching over to Bharat Stage (BS)-4 emission norms from Thursday. These cities are Ankaleshwar in Gujarat, Hisar in Haryana and Bharatpur in Rajasthan.
Already 13 cities, including Delhi NCR, Mumbai, Kolkata, Chennai, Bengaluru, Hyderabad, Ahmedabad, Pune, Surat, Kanpur, Agra, Lucknow and Solapur are implementing the BS-4 emission norms from 2010 when the national auto fuel policy was announced.