Which statement best defines Similar Exposure Groups (SEGs)?

• A. Groups of workers having the same general exposure profile because of similarity and frequency of the tasks performed, the materials and processes they work, and the similarity of the way in which they perform work.
• B. Individuals with unique exposure scenarios
• C. Departments within the organization defined by job title
• D. All workers share identical exposure levels across all tasks

Answer: (A)

Similar Exposure Groups are sets of workers who face comparable exposure profiles because they perform similar tasks, use similar materials and processes, and carry out work in similar ways. This grouping hinges on how the work is actually done and the conditions that drive exposure—things like the kinds of activities, the chemicals or dusts involved, and the controls in place. By grouping workers with these shared factors, industrial hygienists can estimate exposures for the whole group with fewer measurements while still capturing the range of potential exposures within that work pattern. It’s about matching exposure potential to work practices, not just job titles or departments, and not assuming everyone experiences the same exposure levels across all tasks.

If a group is built around unique or individual exposure situations, it wouldn’t support efficient or representative monitoring. Similarly, defining groups strictly by job title or by department can miss important differences in tasks and materials that drive exposure. And the idea that all workers have identical exposure levels across every task is not realistic; exposure varies with the specific task, duration, frequency, and controls in place.