Question 294Safety & Environmental - 1st Asst/Chief

The correct answer is C) threshold limit values. Threshold limit values (TLVs) are the airborne concentrations of substances, such as hydrogen sulfide, under which nearly all workers may be repeatedly exposed without adverse health effects. TLVs are established by organizations like the American Conference of Governmental Industrial Hygienists (ACGIH) to provide guidelines for safe exposure levels in the workplace. The other answer choices are incorrect because: A) Exposure limits is a more general term that can refer to any type of limit on exposure, not specifically airborne concentrations. B) Concentration limits is also a broader term that does not specifically refer to the TLV concept. D) Substance limit values is not a commonly used or recognized term in this context.