How do you decide whether to implement PPE or engineering controls for a given hazard?

• A. PPE should be used as the first line of defense for all hazards.
• B. PPE alone is sufficient for all occupational exposures.
• C. Engineering controls are rarely considered in IH decisions.
• D. By applying the hierarchy of controls; prioritize elimination/substitution and engineering controls; use PPE when controls cannot adequately reduce exposure.

Answer: (D)

The decision rests on the hierarchy of controls, a framework that prioritizes hazard reduction at the source over relying on workers to protect themselves. The safest and most reliable approach is to start with elimination or substitution—remove the hazard or swap it for something less hazardous. If that isn’t feasible, implement engineering controls that reduce or remove exposure without relying on behavior, such as enclosure, isolation, or local exhaust ventilation. Only after these options are in place should administrative controls be used to change how people work, and PPE should be added as a last line of defense when the remaining exposure cannot be adequately controlled by higher-level measures. PPE is essential in some cases, but its effectiveness depends on correct selection, proper use, fit, and training, and it does not eliminate the hazard itself.

So the best approach is to apply the hierarchy of controls, prioritize elimination/substitution and engineering controls, and use PPE when the controls available cannot sufficiently reduce exposure.