How should noise exposure be controlled?

• A. PPE first, then administrative controls, then engineering controls; testing is optional.
• B. Administrative controls first, then PPE, then engineering controls; no monitoring.
• C. Engineering controls only; do not use administrative controls or PPE.
• D. Prioritize engineering controls, then administrative controls, and finally PPE; conduct noise monitoring and audiometric testing where required.

Answer: (D)

Noise exposure is best controlled using a layered approach based on the hierarchy of controls. Start with engineering controls to reduce noise at the source or along its path—options like quieter equipment, enclosures, vibration isolation, mufflers, or barriers—so the noise level is lowered for everyone in the area. If exposure remains too high, add administrative controls such as limiting time near noisy processes, rotating workers, and providing training on safe practices; these reduce risk through work organization but depend on proper management and compliance. Only after engineering and administrative measures should PPE be used as the final line of defense, since it relies on correct fit, consistent use, and individual behavior and does not reduce the noise that others are exposed to. In addition, conduct noise monitoring to accurately assess exposure and perform audiometric testing where required to detect early signs of hearing loss and ensure the program stays effective.