Scientific Foresight 2007 Final

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Industrial Hygiene Aspects of Asbestos Litigation

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Scientific Foresight 2007 Final

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

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