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Threshold limit values: historical perspectives and current practice
Journal of Occupational Medicine. : Official Publication of the Industrial Medical Association
|November 1, 1989
Summary
Workplace exposure limits for 376 substances, based on Threshold Limit Values (TLVs), may be unsafe due to flawed development. Medical and industry professionals must ensure worker safety and address knowledge gaps regarding industrial material health effects.
Area of Science:
- Occupational health
- Industrial hygiene
- Toxicology
Background:
- A 1989 Occupational Safety and Health Administration (OSHA) standard established permissible exposure limits (PELs) for 376 substances.
- Over 350 of these PELs were derived from the 1987 Threshold Limit Values (TLVs) list.
Purpose of the Study:
- To evaluate the medical basis and scientific rigor of the TLVs adopted by OSHA.
- To highlight the implications for worker health and safety.
Main Methods:
- Critical review of the TLV development process.
- Analysis of the scientific literature and medical input for TLVs.
- Assessment of potential conflicts of interest in TLV formulation.
Main Results:
- The TLV development process is characterized by a lack of scientific rigor and inadequate medical input.
- Financial conflicts of interest may have influenced the establishment of some TLVs.
- OSHA's adoption of poorly supported TLVs raises concerns about worker safety.
- Industrial medicine's role in identifying health effects below existing limits is underutilized.
Conclusions:
- The medical profession should presume current TLV-based PELs are unsafe until robust scientific literature exists.
- Industry must prioritize medical and exposure monitoring to address knowledge deficits on long-term health effects.