BS-III Vehicles representational image 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 wit 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: "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.
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