To reduce the probability of exposure to a hazard, which of the following must be assessed?

• A. Personal knowledge of hazards
• B. Containment of chemicals
• C. Amount of chemical used
• D. Type of personal protective equipment needed

Answer: (B)

Focusing on preventing release and spread directly reduces the chance that someone will be exposed. Containment of chemicals keeps the hazard within a controlled space—using sealed vessels, lids, fume hoods, and other enclosed systems—so the hazard doesn’t escape into the work environment. Knowledge of hazards and safe practices helps workers handle materials more safely, but without containment the hazard can still be released. The amount used influences how much chemical could be released, affecting potential exposure magnitude, not the basic likelihood of exposure by itself. Personal protective equipment provides a barrier if exposure occurs, but it doesn’t prevent the exposure event from happening in the first place. Therefore, containment is the most effective measure to reduce the probability of exposure.