TLV-PA Under Study

Physical Agents Under Study (TLV-PA)

ACGIH® has a procedure that provides the public with an indication of where those chemical substances and physical agents under study fall in the development process. For more information, please see the ACGIH® TLV®/BEI® Development Process.


  • Audible Sound

Optical Radiation

  • Lasers
  • Light and Near-infrared radiation
  • Non-laser Optical Radiation
  • Ultraviolet Radiation


  • Hand Activity
  • Hand-Arm Vibration
  • Lifting and Carrying
  • Push/Pull

Ionizing Radiation

Thermal Stress

  • Cold stress

Other Issues Under Study
Appendix B: Personal Physiologic Monitoring in the Workplace
Appendix C: Statement on Fatigue and its Management in the Workplace
Generalized Fatigue and Work Schedules
Head supported mass and neck loading
Hyperbaric pressure
Hypobaric pressure
Sensory-induced motion sickness