Term: Threshold Limit Value
Definition: Threshold Limit Value (TLV) refers to the maximum concentration of a substance, such as asbestos fibers, in the air that most workers can be exposed to during a standard workday without experiencing adverse health effects.
Phonetic Pronunciation: (THRESH-hold LIM-it VAL-yoo)
Etymological Origin: The term originates from the Old English word threscold (meaning "doorway or limit") and the Latin word limitem (meaning "boundary"). "Value" comes from the Latin valere, meaning "to be strong or worth." Together, the term signifies a boundary or limit of exposure that is considered safe.
Significance in Asbestos Context: TLVs are critical in the field of asbestos as they establish guidelines for workplace safety by limiting exposure to airborne asbestos fibers. Historically, TLVs for asbestos were set by organizations like the American Conference of Governmental Industrial Hygienists (ACGIH). However, these values have been criticized for being influenced by industry interests and for failing to adequately protect workers from diseases like asbestosis, mesothelioma, and lung cancer. TLVs are often referenced in litigation to determine whether employers adhered to safety standards or exposed workers to hazardous conditions.
Synonyms or Related Terms: Exposure limit, permissible exposure limit (PEL), occupational exposure limit (OEL), air quality standard.
Example Sentence: "The outdated Threshold Limit Value for asbestos exposure failed to prevent workers from developing mesothelioma, leading to numerous lawsuits against negligent employers."
Common Misconceptions:
