Concept:Green Muffler is a method of reducing noise pollution by planting dense rows of trees around noisy areas like roads, industries, and residential zones.
Explanation:Trees act as natural sound barriers. They absorb and deflect noise, especially high-frequency sounds that are most annoying to humans.
Under the Green Muffler scheme, 4–6 rows of trees are planted. Common species used are Ashoka and Neem, which have broad leaves and dense foliage.
This plantation reduces noise by about 10 decibels — a 50% drop in perceived loudness according to the USDA National Agroforestry Center.
The trees filter and muffle the noise, preventing it from reaching populated areas effectively.
Answer:C. Noise pollution