Threshold Limit Value (TLV)

Last updated: July 24, 2020

What Does Threshold Limit Value (TLV) Mean?

The threshold limit value (TLV) represents the maximum level of an airborne substance that a worker can be safely subjected to without being susceptible to harm or injury. When concentrations are kept below the TLV, workers may be repeatedly exposed to certain substances over a working lifetime without adverse health effects. If any workers do develop any symptoms within the TLV limit, the effects are expected to be easily detectible, mild and reversible. TLVs vary by chemical substance.

Knowing the short-term exposure limit is important for the safety of personal working near potentially hazardous substances.


Corrosionpedia Explains Threshold Limit Value (TLV)

Workers in the maritime, manufacturing, specialty chemical and other industries are often exposed to airborne substances that have the potential to cause adverse health effects. It is not always practical to eliminate these substances; therefore, a limit is placed on the quantity of these substances a worker can be safely exposed to for long periods.

Threshold limit values (TLVs) are guidelines prepared by the American Conference of Governmental Industrial Hygienists (ACGIH). TLVs are based on scientific opinions and are based solely on health effects. No other factors, such as economic or the technical feasibility of controlling these limits, are considered.

Thus far, TLVs have been established for over 600 chemical substances.


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