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Threshold limit value − time-weighted average (TLV-TWA): The average exposure on the basis of a 8 hours per day, 40 hours per week work schedule. Threshold limit value − short-term exposure limit (TLV-STEL): A 15-minute TWA exposure that should not be exceeded at any time during a workday, even if the 8-hour TWA is within the TLV-TWA.
Threshold Limit Values (TLVs), often determined by the American Conference of Governmental Industrial Hygienists (ACGHI), is a key component in determining the PEL. [11] [10] Other things that contribute to determining the PEL are toxicity and particle size. [10] PELs for chemicals are measured in mg/M 3 (milligrams per cubic meter). [2]
The first list of Threshold Limit Values and Biological Exposure Indices (the TLVs and BEIs book) was published in 1962. A new edition is now published annually. Today's list of TLVs and BEIs includes over 600 chemical substances and physical agents, as well as over 30 Biological Exposure Indices for selected chemicals.
The American Conference of Governmental Industrial Hygienists publishes a more extensive list of STELs as threshold limit values (TLV-STEL). [ 5 ] Similar national exposure limits
To control an airborne dust, the workplace must first monitor the air for exposures. Typically, concentration of air contaminants is measured and compared to set exposure limits. In the United States, these often follow personal exposure limits (PEL) set by OSHA , or threshold limit values (TLV) set by ACGIH.
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The database "GESTIS - International limit values for chemical agents" [6] contains a collection of occupational limit values for hazardous substances collected from 35 lists from 29 countries: various EU member states, Australia, Canada, Israel, Japan, New Zealand, Singapore, South Korea, Switzerland, China, Turkey, and the United States. The ...
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