What are the two main outcomes of an exposure assessment in industrial hygiene?

• A. Employee training and shift scheduling.
• B. Waste disposal and energy use.
• C. Risk characterization and selection of appropriate controls.
• D. Equipment maintenance and downtime planning.

Answer: (C)

Exposure assessment aims to quantify how much and how long workers are exposed to a hazard and to interpret what those exposure levels mean for health risk. The two main outcomes are risk characterization and selecting appropriate controls.

Risk characterization involves estimating the magnitude, duration, and frequency of exposure for workers, identifying who is most at risk, and considering variability and uncertainties. This helps determine whether the exposure poses a health risk and how serious that risk might be, forming the basis for deciding if actions are needed.

Selecting appropriate controls follows from the risk characterization. It means choosing and implementing measures to reduce exposure to acceptable levels, typically starting with engineering controls (like ventilation or enclosure), followed by administrative controls (such as changes in work practices or scheduling), and, when necessary, personal protective equipment. The goal is to achieve exposure levels that are protective of health while balancing feasibility and effectiveness.

Other options aren’t the primary outcomes of an exposure assessment. Training and shift scheduling may be informed by exposure findings but aren’t the core deliverables of the assessment itself. Waste disposal and energy use relate to environmental and sustainability concerns rather than directly to exposure risk. Equipment maintenance and downtime planning affect operations and reliability, and while good maintenance can reduce exposures, they are not the direct two outcomes produced by an exposure assessment.