A) air
B) water
C) soil
D) noise
Correct Answer: D
Solution :
Green muffler is growing of green plants along road side to reduce noise pollution. Green belt is an area left out for growth of vegetation. It is important in cities and towns for reducing of noise and air pollution, reduction in level of \[C{{O}_{2}}\], release of \[{{O}_{2}}\], moderation of weather condition, providing aesthetic pleasure and open space for the resident.
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