Explanation:

 • The Ministry of Road Transport and Highways has decided to jump from BS-IV to BS-VI emission norms directly. The Indian government will skip BS-V emission norms altogether and the new norms will be in place by April 1, 2020.
• The Auto Fuel Policy 2003 had recommended implementation of BS-VI norms by 2024. Earlier in the draft notification issued by the Union Ministry of Road Transport and Highways had advanced dates for implementation of BS-V norms to 2019 and BS-VI norms to 2021.
• Presently BS-IV auto fuels are being supplied in whole of northern India covering states like Punjab, Haryana, Jammu and Kashmir, Himachal Pradesh, Uttarakhand, Delhi, parts of Rajasthan and western Uttar Pradesh. While rest of the country is being supplied has BS-III grade fuel. The deadline implementation for BS-IV auto fuels is 2017 across the country
What are BS norms?
• Bharat Stage emission standards, introduced in 2000, are emission standards that have been set up by the Central government to regulate the output of air pollutants from internal combustion engine equipment, including motor vehicles.
• The different norms are brought into force in accordance with the timeline and standards set up by the Central Pollution Control Board which comes under the Ministry of Environment and Forests and Climate Change.
What is BS VI norms:
• The move from BS-IV or Euro 4 to BS VI will require significant investment in technologies like Diesel Particle Filter (DPF) and Selective Catalytic Reduction (SCR). DPF, which comes under BS-V norms will now incorporated in BS-VI vehicles. In stage VI, selective catalytic reduction technology has to be optimized.