Question

how the forest absorbs noise of the nearby highway?​

Answer 1

Trees that not only absorb carbon dioxide, give shade, avoid soil erosion it also helps to reduce sound pollution. One way to reduce sound pollution is sound absorption. Tree parts such as thick branches, leaves and wood are effectively absorb sound. So it reduce sound.

Answer 2

$\huge\bold\red{HELLO!}$

It is not an unknown fact that noise can reach unhealthy levels in urban areas. Cities across the world have acknowledged the impacts of noise pollution and enacted by-laws and practices to battle this increasing environmental issue.

Noise abatement has become an important consideration for many municipalities as they constantly look at ways of suppressing and dampening surrounding noise from nearby roads, railways, and airports. Urban trees can be used as sound barrier to reduce noise pollution. As with planting for wind or visual barriers, the selection and arrangement of the trees is key to a successful outcome. Where solid barriers such as fences are frequently used as sound barriers, trees and shrubs can also be effective. Where space permits, thick strips of vegetation in conjunction with landforms or solid barriers can reduce highway noise by 6 to 15 decibels (D.I. Cook). Because trees absorb more high frequency noise than low frequency, this makes them ideal for use as sound barriers.