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. Tier 1 indicates which chemical substances and physical agents may move forward as an NIC or NIE in the upcoming year, based on their status in the development process. Tier 2 consists of those chemical substances and physical agents that will not move forward, but will either remain on or be removed from the Under Study list for the next year. For more information, please see the ACGIH® TLV®/BEI® Development Process

Tier 1 (may move forward with an NIC proposal in 2018) 

  1. Acoustic
    • Infrasound and Low-frequency sound
    • Audible sound (added 6-13-17)
  2. Optical Radiation
    • Lasers
  3. Ergonomics
    • Lifting
    • Hand–arm vibration
    • Whole-body vibration
  4. Thermal Stress
    • Heat stress and strain

Other Issues Under Study

  1. Generalized fatigue and work schedules
  2. Hyperbaric pressure
  3. Introduction to the Physical Agents Documentation (added 6-13-17)
  4. Introduction to the Physical Agents in the TLVs® and BEIs® book (added 6-13-17)
  5. Multiple shock (added 6-13-17)
  6. Neuroendocrine effects of light
  7. Personal physiologic monitoring (added 6-13-17)
  8. Sensory induced motion sickness (added 6-13-17)
  9. Whole-body vibration (including Low-frequency sound) (added 6-13-17)

Tier 2 (will not move forward with an NIC proposal in 2018) 

  1. Acoustic
    • Ultrasound
  2. Optical Radiation
    • Light and near infrared radiation (added 6-13-17)
    • Ultraviolet radiation
  3. Thermal Stress
    • Cold stress

Other Issues Under Study

  1. Hypobaric pressure