What is the typical use of TLVs in industrial hygiene practice?

• A. For preventive exposure control; not enforceable limits.
• B. For setting legally binding exposure limits.
• C. For calibrating instruments.
• D. For measuring workplace noise.

Answer: (A)

TLVs act as advisory exposure guidelines used in industrial hygiene to help prevent overexposure. They provide targets for what’s considered acceptable airborne concentrations (and related brief-exposure limits) so you can design and evaluate controls—engineering, administrative, or PPE—and interpret sampling results. They’re not legally binding limits; they’re guidelines used to steer protective actions rather than to establish enforceable regulations. That’s why this is the best answer: TLVs are about preventive exposure control and risk reduction, not about setting enforceable standards, calibrating instruments, or measuring noise.