Which sampling approach is BEST for determining a worker's exposure?

• A. Full Period SINGLE Sampling
• B. General Area Sampling
• C. Full Period CONSECUTIVE Sampling
• D. Personal Air Sampling

Answer: (C)

Capturing exposure accurately requires watching how a worker’s inhaled air changes over the entire shift. Taking consecutive samples throughout the full period in the worker’s breathing zone provides a data set that reflects the varying tasks, processes, and controls the worker experiences. This approach yields a more reliable estimate of the time-weighted average exposure than a single snapshot, and it helps identify when and where exposure spikes occur.

General area sampling only measures ambient room air and doesn’t represent what the worker actually breathes. A single sample can miss peaks or low periods, so it may under- or overestimate exposure. Taking multiple consecutive samples over the full period addresses these issues by building a complete exposure profile, which is essential for accurate assessment and effective control planning.