Which sequence best represents a proper exposure control approach?

• A. Wait for incidents and then react
• B. Hazard assessment, mitigate at the source where possible, implement controls, monitor and adjust
• C. Install PPE first, then ignore
• D. Only training matters

Answer: (B)

A proactive exposure-control strategy based on the hierarchy of controls starts with hazard assessment to identify where exposure could occur. Then you reduce or eliminate the hazard at the source whenever possible—this means using containment, enclosed processes, and engineering controls like proper ventilation or local exhaust to stop contaminants from entering the workplace. Next, you layer in additional protections and practices to further cut risk, such as administrative controls, safe work procedures, and training, with PPE serving as a last line of defense when residual risk remains. Finally, you continuously monitor exposure and the performance of these controls, adjusting as needed based on measurements, audits, and feedback.

This approach is best because it emphasizes preventing exposure at the source and using multiple safeguards rather than relying on a single measure. Waiting for incidents and reacting is too reactive and often too late. Relying on PPE first, or treating training as the sole solution, ignores the more effective, upstream controls and the need for ongoing verification. By integrating hazard identification, source reduction, layered controls, and monitoring, you create a robust, adaptable exposure-management plan.