Describe the difference between area sampling and personal sampling for air contaminants.

• A. Area sampling measures concentrations in space; personal sampling measures the worker's actual exposure path
• B. Personal sampling measures the worker's actual exposure path
• C. Both measure the same; no difference
• D. Area sampling uses wearable gear; personal sampling uses fixed monitors

Answer: (A)

The main idea here is how measurement targets differ between fixed-location monitoring and wearable monitoring. Area sampling places samplers at fixed spots in the workplace to measure the contaminant concentration in that space. It shows how air quality varies across a room or area and helps evaluate ventilation, source strength, and background levels. But it doesn’t necessarily reflect what a worker actually breathes, because concentrations can change as people move, as tasks change, or as the source fluctuates. Personal sampling, on the other hand, attaches a sampler to the worker, typically in the breathing zone, so it captures the air the person is inhaling during their work. This provides a direct estimate of the worker’s exposure, taking into account where they go, how long they’re there, and what activities they’re doing. So the description that area sampling measures concentrations in space while personal sampling measures the worker’s actual exposure path best captures the difference. The other statements don’t fit: area sampling isn’t wearable gear, and personal sampling isn’t fixed monitors, and it’s not true that they measure exactly the same thing.