What is known as the maximum concentration of dust or gas safe for human exposure?

The term that refers to the maximum concentration of dust or gas that is considered safe for human exposure is known as the threshold limit value (TLV). TLVs are established by organizations such as the American Conference of Governmental and Industrial Hygienists (ACGIH) and represent a guideline for occupational exposure limits. These values take into account various factors, including the type of substance, duration and frequency of exposure, and individual variability in sensitivity.

Threshold limit values are significant as they help to protect workers’ health by providing a benchmark for acceptable levels of exposure to harmful substances in the workplace. By monitoring the concentration of dust or gas against these values, mining operations can effectively manage environmental conditions and ensure a safer working environment for employees.

Other terms like safe exposure limit, permissible exposure level, and environmental limit value, while related to exposure and safety, do not specifically denote the standard maximum concentration set by health and safety organizations like TLV does. They may refer to broader concepts or be used in different regulatory contexts but do not encapsulate the same standardized measurement that TLVs represent.