What is the Threshold Limit Value-Ceiling (TLV-C)?

The Threshold Limit Value-Ceiling (TLV-C) refers to a concentration of a hazardous substance that should not be exceeded during any part of the workday, as it poses a risk of health effects, including injury, to workers. Thus, it represents the maximum concentration that an individual can be exposed to without anticipated adverse effects.

This definition is critical for ensuring workplace safety, as exceeding this limit could lead to significant health risks. In this context, TLV-C is particularly important for substances that may cause acute adverse effects at certain exposure levels, thereby providing a critical guideline for safety standards in occupational health.

The other choices address different aspects of exposure limits but do not accurately describe the TLV-C. For example, the average concentration limit for a workday or permissible limits for periodic exposure pertain more to other types of Threshold Limit Values such as Time-Weighted Average (TWA) or Short-Term Exposure Limits (STEL), rather than the ceiling limit that individuals should not exceed at any time.