Which sampling method is considered the best for assessing individual worker exposure?

• A. General Area Sampling
• B. Personal Air Sampling
• C. Full Period Single Sampling
• D. Full Period Consecutive Sampling

Answer: (B)

The main idea is to measure what a specific worker actually inhales in their breathing zone during their work. Personal air sampling does exactly that by placing a sampling device on the worker so air drawn into the pump comes from near the nose/mouth area. This captures the real exposure as the worker moves through different tasks and locations, and over the entire work period if you extend the sampling duration. It provides a time-weighted average exposure that's directly comparable to limits and regulations, and it reflects factors like task variability, movement, and any protective equipment the worker uses.

General area sampling, on the other hand, measures environmental concentrations at fixed locations and may not represent the worker’s true inhaled exposure, especially if the worker spends time away from the sampling point or in microenvironments with different concentrations. Single long-period samples and sequential area sampling can miss peaks or fail to capture how exposure changes with tasks, making them less representative of an individual’s actual dose. Personal sampling uniquely links the measurement to the worker’s breathing zone and behavior, giving the most accurate assessment of individual exposure.