What is the difference between tlv and pel

However, if a STEL occurs within that 8 hour test period, the company will need to review the production process to see if additional controls can be put in place to decrease the STEL.

As you can see, each agency evaluation is different. Print Article as PDF. Ceiling Value Ceiling value is the concentration an airborne toxic substance should not exceed at any time during the workday. What does this all mean? All Rights Reserved. We welcome your input on the series!

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A threshold limit value, set by the American Conference of Governmental Industrial Hygienists, is the limit of exposure to a chemical substance that a worker can be exposed to, day after day, without adverse health effects. TLVs are estimates based on the known toxicity of a chemical substance in humans or animals given the currently available analytical and technological resources. To determine TLVs, ACGIH uses committees to review various published literature in disciplines such as industrial hygiene, toxicology and occupational medicine.

TLVs are then developed as recommendations or guidelines and are intended to be interpreted and used by a person trained in the discipline of industrial hygiene. Given the above definitions, the terms still sound remarkably similar. However, their differences are beginning to emerge.