Ambient noise level can be reduced by _______ decibels by planting trees like coconut, neem etc.) near public utilit buildings (like hospitals & schools)

8. Ambient noise level can be reduced by _______ decibels by planting trees like coconut, neem etc.) near public utilit buildings (like hospitals & schools)
o 1-2
o 5-10
o 25-30
o 35-40

Ans: B