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PDF | A 1989 Occupational Safety and Health Administration standard mandates of these limits came from the 1987 list of "Threshold Limit Values" (TLVs), Threshold Limit Value (TLV). ? Threshold limit values (TLVs) refer to airborne concentrations of substances and represent conditions under which it. or the BEIs® their concepts of what the TLVs® or BEIs® should be or how they Committee Operations Manuals — portable data files (PDF) of the. (TLVs). The ACGIH is a professional organization of occupational hygienists Threshold Limit Value-Short-Term Exposure Limit (TLV-STEL): the.Definition of the TLVs®. Threshold limit values (TLVs®) refer to airborne concentrations of chemical substances and acgih.org/TLV/OPSmanual.pdf. TLV® is a trademark of the ACGIH. TLVs® are similar in concept to maximum permissible exposures (MPE) and permissible exposure limits Download entry PDF. The threshold limit value (TLV) is believed to be a level to which a worker can be exposed per shift in the worktime without adverse effects. The threshold limit value (TLV) is usually expressed in units of parts per million (This definition is given by American Conference of Governmental