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What is BS3,BS4 | BS3 Banned | BS3 diferent from BS4

Posted on : April 15, 2017 | post in : Uncategorized |Leave a reply |

New Delhi: Emission standards are instituted and governed by the Central Pollution Control Board which helps to regulate the output of air pollutants from the vehicle’s engine (internal combustion engine).

BS or Bharat Stage are based on European regulation and were first introduced in 2000 and progressively stringent norms have been rolled out with the latest being implementation of BS-IV (Bharat Stage 4) on all vehicles effective from 1st April 2017.

First BS-III rule was introduced in 2005 and was implemented in 15 cities overall and by 2010 the nationwide implementation of BS-III vehicles was completed.
BS-IV for 13 metro cities was introduced in April 2010 and the nationwide implementation is also now completed with Supreme Court banning the sale of all BS-III vehicles starting April 1, 2017.

The nation wide roll out of BS-IV suffered a delay due to lack of availability of BS-IV compliant fuel. Oil makers had to make the necessary investment to manufacture 50 ppm ultra low sulfur required to support BS-IV norms.

Vinod Dasari, President, SIAM said, “Auto Industry has had the capability of making BS4 vehicles since 2010, but lack of proper BS4 fuel prevented it from selling such vehicles, nationwide. Running a BS4 vehicle with BS3 fuel can cause severe problems to some vehicles.”


As per ARAI, the exhaust emissions for BS-III two-wheelers direct that the petrol-powered engine should have carbon monoxide (CO) restricted to 1.00 g/km and Hydrocarbon + Nitrous oxide (HC + NOx) emission level should also not be more than 1.00 g/km. For a vehicle to be BS-IV compliant its must have an emission not more than 0.75 g/km of CO and HC+Nox respectively. This means the engines have to be new in order to emitless pollutants out helping in reduction of overall pollution from the exhaust.

BS-III Vehicles banned: How are BS-III vehicles different from BS-IV
BS-III norms for a commercial vehicle with a gross vehicle weight of less than 3500 Kgs there is an engine steady state cycle test conducted which measures different exhaust parameters like carbon monoxide, Tetrahydrocannabinol, Nitrous oxide, non-methane hydrocarbons, particulate matter etc to ensure channelled exhaust of air pollutants.

BS-III Vehicles banned: How are BS-III vehicles different from BS-IV

Auto-industry has been ready with manufacturing of BS-IV compliant vehicles for months and was always looking forward for this shift. In fact for many years now SIAM has been pushing to ban older vehicles which cause more pollution. However, the Supreme Court’s order to ban the sale of existing BS-III vehicles have come as a shock to the industry but looks like the industry is ready to absorb the losses. The industry plans to export the existing BS-III vehicles and is also looking for a possibility to convert the BS-III vehicles into BS-IV compliance.

“While no one pushed for BS4 fuel availability for 7 years to change over faster, this sudden decision – just a few days before the changeover – is rather unfortunate as it causes undue stress on the entire industry, and causes loss of jobs. Auto Industry, anywhere in the world, requires a stable and predictable policy which allows for long term planning and investments”

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