Which of the following is an engineering control used to reduce exposure to hazards?

• A. Ventilation improvements
• B. PPE
• C. Job rotation
• D. Safety training

Answer: (A)

Engineering controls are physical changes to the workplace that remove or reduce exposure to hazards rather than relying on worker behavior. Ventilation improvements fit this perfectly because they modify the environment to dilute or exhaust contaminants, directly lowering the amount workers inhale. PPE, by contrast, is a barrier kept on the worker and doesn’t change the hazard itself. Job rotation is an administrative control that reduces exposure by changing who does the task or how long they work on it, not by altering the environment. Safety training is another administrative measure that informs workers but doesn’t reduce the hazard exposure itself. So ventilation improvements are the engineering control that lowers exposure at the source.