In the Hierarchy of Safety and Health Controls, which is the highest level?

• A. Warnings
• B. Eliminations or Substitution
• C. PPE
• D. Engineering Controls

Answer: (B)

Removing the hazard from the work environment or replacing it with a less hazardous option is the most effective way to prevent exposure because it eliminates the risk at its source. When the hazard is eliminated or substituted, workers aren’t exposed at all, so there’s no need to rely on other measures to control it later.

Engineering controls, while important, reduce exposure through design changes (like ventilation or isolation) but don’t guarantee zero exposure and require ongoing maintenance. Administrative controls rely on people changing how they work, which can be variable and depends on compliance. Personal protective equipment provides a safeguard for the individual worker but does not remove the hazard itself and depends on proper use, fit, and availability. Warnings or hazard communications inform workers but do not reduce or eliminate the hazard.

So the highest level in the hierarchy is eliminating the hazard or substituting it with a less hazardous option.