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The term that refers to safe levels of exposure to various chemical substances is TLV, which stands for Threshold Limit Value. TLV is a guideline developed by the American Conference of Governmental and Industrial Hygienists (ACGIH) to represent the maximum allowable concentration of a substance in the workplace air that workers can be exposed to without adverse effects during a typical day or workweek.

This value is important for helping organizations develop safety procedures and protocols to protect employee health. TLVs are crucial in the field of occupational safety and health, as they serve as a benchmark for evaluating exposure levels and implementing necessary control measures.

In contrast, other terms like PEL (Permissible Exposure Limit) are regulatory limits set by agencies such as OSHA, which indicate the maximum level of hazard in the workplace but may differ from TLV in methodology and establishment. EL (Emergency Limit) and MLV (Maximum Limit Value) also represent limits but do not specifically connote the same established guideline functions as TLV in the context of everyday exposure safety.