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How can improved mufflers and engine shielding make trucks quieter?

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Can bubble curtains protect harbor porpoises from noise pollution? — noise pollution Learn about the impact of underwater noise on marine animals, notably harbour porpoises.

Improved mufflers and engine shielding are effective strategies for mitigating noise pollution generated by trucks.

Exhaust Mufflers: Enhancing the efficiency of exhaust mufflers directly reduces the noise produced by the engine's exhaust system, which is one of the primary sources of truck-related sound.1
Engine Shielding: By enclosing the engine with more absorbent materials, the sound waves generated during operation are dampened, preventing them from escaping into the surrounding environment.1

These technical modifications, alongside other measures like optimizing fan blade designs and engine enclosures, help manufacturers meet established decibel limits, such as the 80-decibel standards often enforced by authorities in the United States and the European Union. Reducing such excessive noise is essential for protecting human health and environmental quality.12