What are BS-VI Norms?

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What are BS-VI Norms? Blog Image


The Supreme Court recently directed the Union government to frame a national policy to phase out heavy-­duty diesel vehicles like trucks and trailers, and replace them with BS­-VI vehicles.

About BS-VI Norms

  • Bharat stage (BS) emission standards are laid down by the government to regulate the output of air pollutants from internal combustion engine and spark-ignition engine equipment, including motor vehicles.
  • India has adopted BS Emission Standards since 2000, modelled on European Union norms.
  • The first emission norms with the name ‘India 2000’ were introduced in the year 2000. BS2 and BS3 were introduced in 2005 and 2010, while BS4 norms came into effect in 2017 with stricter emission standards or norms.
  • The BS standards regulate tailpipe emissions of air pollutants, including particulate matter, SOx, and NOx, as well as carbon monoxide, hydrocarbons, and methane. 
  • Who sets them? The standards and timeline for implementation are set by the Central Pollution Control Board under the Ministry of Environment, Forests and Climate Change.
  • In April 2020, India leapfrogged from BS-IV to the implementation of BS-VI. The central government has mandated that vehicle makers must manufacture, sell, and register only BS-VI (BS6) vehicles from April 1, 2020.
    • It is applicable for cars, trucks, buses, three-wheelers, and two-wheelers (motorcycles, scooters, and mopeds).
    • This emission norm does not apply to off-highway equipment and vehicles such as tractors, back-hoe loaders, excavators, etc.
  • Difference between BS-IV and BS-VI:
    • Both BS-IV and BS-VI are unit emission norms that set the maximum permissible levels for pollutants that an automotive or a two-wheeler exhaust can emit.
    • Compared to BS4, BS6 emission standards are stricter. 
    • The main difference is in the amount of sulphur in the fuel, which is reduced from 50 ppm in BS IV fuel to 10 ppm in BS VI fuel for both gasoline and diesel. Hence, BSVI engines produce less harmful emissions and pollutants.

Q1) What is the Central Pollution Control Board (CPCB)?

The Central Pollution Control Board (CPCB is a statutory body constituted in September, 1974 under the Water (Prevention and Control of Pollution) Act, 1974. Further, CPCB was entrusted with the powers and functions under the Air (Prevention and Control of Pollution) Act, 1981. Principal Functions of the CPCB, as spelt out in the Water (Prevention and Control of Pollution) Act, 1974, and the Air (Prevention and Control of Pollution) Act, 1981, (i) to promote cleanliness of streams and wells in different areas of the States by prevention, control and abatement of water pollution, and (ii) to improve the quality of air and to prevent, control or abate air pollution in the country.

Source: Frame policy to phase out heavy diesel vehicles: Supreme Court to Centre