What does tlv stand for in whmis?

In WHMIS (Workplace Hazardous Materials Information System), TLV stands for "Threshold Limit Value." It refers to the maximum concentration of a hazardous substance in the air to which workers can be exposed without adverse health effects. TLVs are established by organizations like the American Conference of Governmental and Industrial Hygienists (ACGIH) and serve as guidelines for occupational exposure limits.