Safety Trained Supervisor in Construction (STSC) Practice Exam 2026 - Free STSC Practice Questions and Study Guide

Question: 1 / 400

Which of the following best describes the Threshold Limit Value (TLV)?

The maximum level of hazardous chemical exposure allowed at work

The minimum required safety training for workers

The amount of hazardous chemical exposure to which a worker can be exposed

The concept of Threshold Limit Value (TLV) is integral to understanding workplace exposure to hazardous substances. TLVs represent the concentration levels of chemical substances to which workers can be repeatedly exposed without adverse effects on health. It serves as a guideline for occupational exposure, indicating that below this threshold, the risks of long-term health effects are minimized for the majority of workers.

Choosing the option referring to the amount of hazardous chemical exposure that a worker can tolerate under typical working conditions accurately reflects the purpose of TLVs. These values are based on scientific research and are designed to ensure that exposure levels are safe for workers over an extended period. Understanding TLVs is critical for any safety professional in construction, as it informs how to assess and manage potential hazards on job sites effectively.

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The level at which a chemical is considered non-hazardous

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