Which of the following is an example of an engineering control to reduce noise exposure?

Engineering controls are modifications to the workplace or equipment that are designed to minimize or eliminate noise exposure at its source. Installing sound barriers is a clear example of an engineering control because it involves physical changes to the environment that help absorb or deflect sound waves, thus reducing the overall noise level that workers are exposed to.

By using sound barriers, such as walls or enclosures around noise-producing machinery or within high-noise areas, the noise can be effectively reduced before it reaches the workers. This proactive approach not only lowers the risk of hearing loss but also enhances the overall working environment.

In contrast, the other options focus on behavioral or administrative measures rather than structural modifications. Issuing earplugs is a personal protective equipment measure, offering training on noise awareness is an educational approach, and scheduling quieter work shifts is a management strategy. While these strategies are beneficial for hearing conservation, they do not address the source of the noise, which is what engineering controls specifically aim to accomplish.