Post-control measurements are used to:

• A. Confirm exposure reductions and verify control effectiveness.
• B. Compare with baseline only.
• C. Replace the need for baseline data.
• D. Assess PPE preference.

Answer: (A)

Post-control measurements are about validating the performance of controls after they are in place. They are used to confirm exposure reductions and verify control effectiveness, showing whether the implemented engineering or administrative measures actually lowered workers’ exposures to acceptable levels and are functioning as designed. This step helps quantify how much risk has been reduced and flags any issues in operation, maintenance, or design that might require adjustments or additional controls. Baseline data establish where you started, but the purpose of post-control measurements is to demonstrate that the controls achieve the intended protection. These measurements are not about choosing PPE or replacing baseline data, and they don’t focus on PPE preference.