Green Muffler is

Green Muffler is a specialized technique used to mitigate noise pollution by planting dense vegetation buffers. It typically involves planting 4-6 rows of trees and shrubs around noisy areas such as roadsides, industrial zones, and highways [1]. These vegetation belts act as physical barriers that absorb, filter, and obstruct sound waves, preventing them from reaching nearby residential populations . The term 'muffler' is used metaphorically, similar to a vehicle silencer, to describe the sound-dampening effect of the foliage . While roadside vegetation can also provide secondary benefits like reducing air pollutants (particulate matter) and improving aesthetics, its primary definition in environmental science is as a noise reduction strategy [3]. Large-scale tree plantations serve as effective buffer zones because plants naturally absorb sound energy, thereby reducing the intensity of urban and industrial noise [4].

Sources

1. [1] https://hppcb.nic.in/pdf/himgrih.pdf
2. [2] https://pmc.ncbi.nlm.nih.gov/articles/PMC6060415/
3. [3] https://www.sciencedirect.com/science/article/pii/S0048969722069133
4. [4] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 6: Environmental Degradation and Management > Control of Noise Pollution > p. 43