Scientific Foresight 2007 Final
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Industrial Hygiene Aspects of Asbestos Litigation

Industrial Hygiene Aspects of Asbestos Litigation

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  • 1. Industrial Hygiene Aspects of Asbestos Litigations By Gyan S. Rajhans, CIH,ROH,PE Scientific Foresight 2007 Patna, Bihar, India GSR & Associates Inc. Canada
  • 2. Definition of Industrial Hygiene Art & Science
    • Anticipation
    • Recognition
    • Evaluation
    • Control
    Scientific Foresight 2007, Patna, Bihar India GSR & Associates Inc. Canada
  • 3. Evaluation
    • Measure Health Effects
    • Measure Exposure
    • Need Experts
    Scientific Foresight 2007, Patna, Bihar India GSR & Associates Inc. Canada
  • 4. MEASURES OF EXPOSURE LEVELS FOR ASBESTOS
    • mppcf-million particles per cubic foot
    • f/cc - fibers per cubic centimeter
    • mg/m³ - milligrams per cubic meter
    Scientific Foresight 2007, Patna, Bihar India GSR & Associates Inc. Canada
  • 5. Development of Asbestos EXPOSURE LIMITS
    • ACGIH Asbestos TLVs
    • MAC- misnomer
    • TWA - Eight hour
    • STEL: 15 Minutes
    • CEILING VALUES: Never exceeded
    • OSHA PELs
    • TWA
    • CEILING
    Scientific Foresight 2007, Patna, Bihar India GSR & Associates Inc. Canada
  • 6. Exposure Evaluation
    • Concentration of asbestos fibers in the air
      • Sampling
      • Analysis
    • Duration of exposure
    • Comparison with standards
    Scientific Foresight 2007, Patna, Bihar India GSR & Associates Inc. Canada
  • 7. Exposure Duration
    • How long was the work day / work week?
      • Type of task
      • Duration of tasks
    • How long were breaks?
      • Are breaks really zero exposure?
    Scientific Foresight 2007, Patna, Bihar India GSR & Associates Inc. Canada
  • 8. Several Sources of Exposures
    • The sources may not be distinguishable
    • Occupational vs. Environmental
    • Hobbies
    • Difficulty in assessing cumulative lifetime exposure
    Scientific Foresight 2007, Patna, Bihar India GSR & Associates Inc. Canada
  • 9. Visible Dust ?
    • Visible dust may or may not contain asbestos
    • Do they contain respirable fibers?
    • Stanton Fibers
    • Environment
    Scientific Foresight 2007, Patna, Bihar India GSR & Associates Inc. Canada
  • 10. Is the methodology used retrospectively to estimate the exposure dose supported by scientific reasoning? Scientific Foresight 2007, Patna, Bihar India GSR & Associates Inc. Canada
  • 11. Factors For Retrospective Exposure Assessment
    • Work history
    • Are data available for all types of worksites?
    • Ventilation
    • Respirators
    Scientific Foresight 2007, Patna, Bihar India GSR & Associates Inc. Canada
  • 12. Reconstruction of Exposure
    • Reliable data: Peer reviewed, published
    • Detailed description of tasks at the time of exposure measurement
    Scientific Foresight 2007, Patna, Bihar India GSR & Associates Inc. Canada
  • 13. Fallacies
    • Dose-Response
      • Area versus personal sampling
    • Latency
    • Expertise
    • Hands on experience
    Scientific Foresight 2007, Patna, Bihar India GSR & Associates Inc. Canada