Question

Assertion: Bharat stage IV emission norms have been in place since April 2010, for four wheelers in 13 mega cities of India.
Reason: Green muffler scheme refers to the plantation of trees and shrubs along roadsides and is effective to control noise pollution only.

A. Both assertion and reason are correct and reason is the correct explanation for assertion.
B. Both Assertion and reason are correct but reason is not the correct explanation for assertion.
C. Assertion is correct but the reason is incorrect.
D. Both assertion and reason are incorrect.

Answer 1

Bharat stage IV standards cover motorised two wheeled vehicles with engine displacement volume above 50 cubic centimetres (cc) and a maximum design speed above 50km/h. Green muffler scheme is a technique of reducing noise and air pollution.

Complete Answer:
- Bharat stage emission standards are emission standards issued by the government of India in order to control the emission of air pollutants from motor vehicles.
- Bharat stage IV norms have been in place since April 2010, for four wheelers in 13 mega cities of India, which are Delhi and NCR, Mumbai, Kolkata, Chennai, Bangalore, Surat, Kanpur, Agra, Lucknow and Sholapur.
- Green Muffler is a technique of reducing noise as well as air pollution by planting 4-6 rows of green plants around the populated areas as along roadsides, industrial areas etc.
- So that dense trees reduce noise pollution as they filter out the noise and prevent it from reaching the citizens. It also reduces air pollution as the trees and shrubs absorb pollution gases and cause settling of suspended particulate matter.

So the correct answer is option ’C’ i.e. assertion is correct but the reason is incorrect.

Note: Bharat stage IV emission norms were enforced in the entire country in April 2017, it means that all the vehicles manufactured and sold after April 2017 must be compliant with the BS IV standards. Green muffler zone has dual functions for both noise and air pollution.