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Preferred Label : threshold limit value;

Detailed label : threshold limit value (TLV);

IUPAC acronym : TLV; TWA; ACGIH; STEL;

IUPAC definition : The concentration in air to which it is believed that most workers can be exposed daily without an adverse effect ( i i.e. /i , effectively, the threshold between safe and dangerous concentrations). The values were established (and are revised annually) by the ACGIH and are time-weighted concentrations (TWA) for a 7- or 8-h workday and 40-h workweek, and thus are related to chronic effects. A short-term exposure limit (STEL) is defined as a 15-min TWA exposure, which should not be exceeded at any time during a workday even if the 8-h TWA is within the TLV-TWA.;

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The concentration in air to which it is believed that most workers can be exposed daily without an adverse effect ( i i.e. /i , effectively, the threshold between safe and dangerous concentrations). The values were established (and are revised annually) by the ACGIH and are time-weighted concentrations (TWA) for a 7- or 8-h workday and 40-h workweek, and thus are related to chronic effects. A short-term exposure limit (STEL) is defined as a 15-min TWA exposure, which should not be exceeded at any time during a workday even if the 8-h TWA is within the TLV-TWA.

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30/07/2025


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