Green muffler play a important role against Radioactive pollution, Soil pollution, Noise pollution, Air pollution

A. Noise pollution is a physical form of pollution that affects the receiver directly.
B. Radioactive pollution is caused by the wastes which release radioactivity rays from nuclides of their elements.
C. Soil pollution is the alteration in soil quality caused by removal or addition of substances and factors which decreases its productivity.
D. Air pollution is the undesirable change in natural characteristics of the atmosphere due to the contamination of the indoor and outdoor environment by any chemical, biological and physical agent.
The green muffler is a technique in which many rows of plants are made in noisy places because they absorb the noise pollution.So, the correct answer is 'Noise pollution'.