Explain the principle of 'control of exposure' in chemical risk management.

Explain the principle of 'control of exposure' in chemical risk management.

• A. Elimination/substitution, engineering controls, administrative controls, and PPE
• B. PPE first, then engineering controls
• C. Administrative controls only
• D. Elimination only

Answer: (A)

Controlling exposure to chemicals uses a layered approach that starts with removing the hazard or replacing it with something less dangerous, then adding physical or process-based barriers, followed by procedures that limit exposure time and tasks, and finally relying on protective gear as a last line of defense. The most effective path is to eliminate or substitute the chemical because this removes the risk at its source. When elimination isn’t possible, engineering controls come next, such as closed systems or local exhaust ventilation, to reduce how much chemical reaches workers. If exposure can still occur, administrative controls—like work practices, training, and scheduling—help minimize the duration and circumstances of contact. Only after these layers should personal protective equipment be used, since it depends on proper use, fit, and maintenance and does not remove the hazard itself. This comprehensive, stepwise strategy is why the best choice includes elimination/substitution, engineering controls, administrative controls, and PPE together. The other options fall short because they rely on a single or inappropriate subset of controls (for example, prioritizing PPE, or using only administrative measures, or using elimination alone), leaving gaps in protection.

Controlling exposure to chemicals uses a layered approach that starts with removing the hazard or replacing it with something less dangerous, then adding physical or process-based barriers, followed by procedures that limit exposure time and tasks, and finally relying on protective gear as a last line of defense. The most effective path is to eliminate or substitute the chemical because this removes the risk at its source. When elimination isn’t possible, engineering controls come next, such as closed systems or local exhaust ventilation, to reduce how much chemical reaches workers. If exposure can still occur, administrative controls—like work practices, training, and scheduling—help minimize the duration and circumstances of contact. Only after these layers should personal protective equipment be used, since it depends on proper use, fit, and maintenance and does not remove the hazard itself. This comprehensive, stepwise strategy is why the best choice includes elimination/substitution, engineering controls, administrative controls, and PPE together. The other options fall short because they rely on a single or inappropriate subset of controls (for example, prioritizing PPE, or using only administrative measures, or using elimination alone), leaving gaps in protection.