I keep getting told that science tells us to use highway sound barriers and trees to reduce noise pollution. The effect that highway sound barriers has is quite immediately obvious but no matter how many trees I plant there never appears to be any noticeable effect on noise pollution.
The Cities: Skylines Wiki states:
A high level of noise pollution reduces land value and citizen happiness. Planting trees and creating roads with trees blocks noise.
This is similar wording to the tutorial tips in game however planting trees seems to have no effect on noise.
How great is the effect of trees on noise pollution?