Which of the following best describes a representative sampling approach in exposure assessment?

• A. Collecting samples only at the start of the shift in one location.
• B. Sampling at varying locations and times and using enough samples to reflect variability.
• C. Sampling only after a regulatory inspection.
• D. Sampling in quiet periods only.

Answer: (B)

In exposure assessment, you want the data to reflect the actual range of exposures workers experience under normal operations. That means gathering samples from multiple locations and at different times and tasks, and collecting enough samples to capture the variability across shifts, processes, and conditions. This approach provides a realistic picture of typical exposure levels and helps identify occasions of higher exposure, rather than giving a narrow view from a single moment or place.

If you only sample at the start of a shift in one location, you miss changes that occur later in the day, across other areas, or during different tasks, leading to a misleading assessment. Sampling only after a regulatory inspection is reactive and may not represent everyday operations. Sampling during quiet periods misses peak exposures that can occur during busy tasks, again underestimating risk.