How is exposure data used to drive decisions about control measures?

• A. Measured exposures are ignored in decision making.
• B. Exposures are used only for documentation, not for controls.
• C. Measured exposures are compared to limits; if above, implement controls; effectiveness is reassessed with post-control measurements.
• D. Post-control measurements are never used.

Answer: (C)

Measuring exposures and using those data to guide action creates a clear decision path: compare what workers are exposed to with established limits, and act based on that comparison. When measurements are at or below the limit, current controls can stay in place with routine monitoring. If exposures exceed the limit, you implement controls to reduce the dose—prioritizing engineering controls, then administrative measures or PPE as needed. After putting controls in place, you re-measure to verify that the exposures have dropped to or below the limit and to assess whether the controls are actually effective. If the post-change measurements still show overexposure, you adjust or add controls and repeat monitoring. This data-driven loop makes protection real and verifiable rather than speculative. Choices that ignore measurements, use data only for documentation, or skip post-control verification miss the essential connection between measurement and protection.