In General Area Sampling, the method is used to determine the efficacy of controls.

• A. It is attached to the worker.
• B. It is used to determine the efficacy of controls.
• C. It measures personal exposure.
• D. It is never used as an alarm.

Answer: (B)

General area sampling focuses on the air in the work environment, not on a specific person. By placing samplers around the area, you observe the overall contaminant level in that space, which lets you judge how well controls like ventilation, enclosures, or process changes are reducing exposure. If the area concentrations stay low, the controls are effective; if they’re still high in certain spots, adjustments are needed. This approach differs from personal sampling, which attaches to a worker to estimate an individual’s exposure rather than the environmental performance of controls. Some area monitoring setups can trigger alarms when levels exceed a threshold, but the primary purpose of general area sampling is to evaluate control efficacy.