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Threshold limit values (TLVs) specifically refer to airborne concentrations of substances that are believed, based on current scientific evidence, to be safe for most workers. TLVs are guidelines established by organizations like the American Conference of Governmental and Industrial Hygienists (ACGIH) to help ensure that exposure to hazardous substances in the workplace remains within levels that have been determined to pose minimal risk to health.

These values are crucial for protecting employees from potential health risks associated with exposure to chemicals and other hazardous materials in their work environment. TLVs consider both the duration and frequency of exposure and serve as a crucial tool for industrial hygienists and safety professionals in assessing workplace safety and taking necessary precautions or implementing control measures.

The other options do not accurately represent the concept of TLVs: the maximum temperature in a workplace pertains to thermal exposure limits, minimum safety standards relate to compliance requirements but do not specifically address exposure concentrations, and recommended noise levels are concerned with auditory safety rather than chemical exposure.