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An ACGIH designated degree of exposure to contaminants and expressed as parts of vapor or gas per million parts of air by volume at 25°C and 760mmHG pressure, or as approximate milligrams or particulate per cubic meter of air (mg/m³). An exposure level under which most people can work consistently for 8 hours a day, with no harmful effects. TLVs are listed as either an 8-hour TWA or a 15-minute STEL.
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