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Epidemiologic basis for the asbestos standard.

P E Enterline

    Environmental Health Perspectives
    |October 1, 1983
    PubMed
    Summary

    Detecting asbestos-related health effects below the current 2 fibers/cm³ standard is challenging. Epidemiological studies require large sample sizes, suggesting alternative health outcome measures are needed for lower asbestos exposure levels.

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    Area of Science:

    • Occupational Health
    • Environmental Health
    • Toxicology

    Background:

    • Current occupational asbestos exposure limit is 2 fibers/cm³ over 8 hours.
    • A committee deems this standard inadequate, citing disease at all exposure levels.
    • A proposed 0.1 fibers/cm³ limit is based on detection limits, not epidemiological data.

    Purpose of the Study:

    • To evaluate the feasibility of detecting health effects from asbestos exposure below the current 2 fibers/cm³ standard.
    • To review existing studies on asbestos exposure and lung cancer risk.
    • To determine if current epidemiological methods can identify risks at lower exposure levels.

    Main Methods:

    • Review of five studies examining the asbestos fiber exposure-lung cancer relationship.
    • Calculation of sample sizes required for epidemiological detection of excess risk.
    • Analysis of the utility of current epidemiological approaches for low-level exposure.

    Main Results:

    • Epidemiological detection of lung cancer risk associated with exposure below 2 fibers/cm³ is unlikely with current methods.
    • Sample size calculations indicate that detecting effects at lower levels requires impractically large study populations.
    • The proposed 0.1 fibers/cm³ limit is not supported by epidemiological evidence.

    Conclusions:

    • Detecting asbestos-induced lung cancer through epidemiology below the 2 fibers/cm³ standard is not feasible.
    • Alternative health outcome measures beyond lung cancer and clinical asbestosis are necessary.
    • Evidence for lowering the current asbestos exposure standard requires different observational approaches.

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