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Long answer type question How BS emission standards changed over time? Why is it essential? - Biology

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Answer in Brief

Long answer type question

How BS emission standards changed over time? Why is it essential?

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Solution

i. According to the new fuel policy, the norms are set to reduce sulphur and aromatic content of petrol and diesel. Another provision is the up-gradation of engines. For this, Bharat stage emission standards (BS) are set. These standards are equivalent to Euro norms and have evolved on similar lines as Bharat Stage II (BS-II) to BS-VI from 2001 to 2017.

ii. It is essential to change BS emission standards in order to limit the release of air pollutants from the internal combustion engine.

iii. In 2001, Bharat stage II emission norms were set for CNG and LPG vehicles. As per Bharat Stage II, the emission of sulphur should be controlled at 50 ppm in diesel and 150 ppm in petrol. Aromatic hydrocarbons should be just 42% in concerned fuel.

iv. The aim was to reduce sulphur emission to 50 ppm in petrol and diesel along with aromatic hydrocarbons to 35%. Hence, the Government of India directly adapted BS-VI in the year 2018, skipping BS V. These efforts decreased the levels of CO2 and SO2 in Delhi.

v. BS emission standards in cities of India:

Vehicle Norms Cities of Implementation
4 wheelers Bharat Stage II All metro cities
4 wheelers Bharat Stage III Throughout the country since October 2010
4 wheelers Bharat Stage IV 13 megacities (Delhi and NCR, Mumbai, Kolkata, Chennai, Bengaluru, Surat, Kanpur, Agra, Lucknow, Solapur) since April 2010.
2 wheelers

Bharat Stage III

Throughout the country since October 2010
3 wheelers Bharat Stage III Throughout the country since October 2010
Concept: Prevention of Air Pollution
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Balbharati Biology 12th Standard HSC for Maharashtra State Board
Chapter 15 Biodiversity, Conservation and Environmental Issues
Exercises | Q 4.3 | Page 342

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