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What Is the Threshold Limit Value (TLV) for Asbestos?

By Bryan McWhorter | Last updated: October 30, 2023

The American Conference of Governmental Industrial Hygienists (ACGIH) recommended exposure limit for asbestos is:

Time weighted average: 0.1 fibers per cubic centimeter (f/cc). OSHA would list this as the permissible exposure limit or PEL.

The ACGIH defines a respiratory fiber as a fiber longer than 5 microns and at least three times as long as their diameter as determined by the membrane filter method at 400-450 X magnification using phase contrast illumination.


The TLV basis for the recommendation is pneumoconiosis, lung cancer and mesothelioma.

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Industrial Hygiene Remediation

Written by Bryan McWhorter | Lead Safety Advisor, Author, Writer, Speaker

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Bryan McWhorter is a safety professional with eight years of experience in driving and teaching safety. Bryan gained his knowledge and experience as the safety officer and Senior Trainer for Philips Lighting. Philips is a strong health and well-being company that promotes a safety first culture.

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