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 2019) 

  1. Acoustic
    • Audible sound
    • Infrasound and Low-frequency sound
  2. Optical Radiation
    • Lasers
    • Ultraviolet radiation
  3. Ergonomics
    • Lifting
    • Hand–arm vibration
    • Whole-body vibration
    • Whole-body vibration (including multiple shock and low-frequency sound)
  4. Thermal Stress
    • Cold stress
    • Heat stress and strain
  5. Ionizing Radiation (added 6-5-18)

Other Issues Under Study

  1. Generalized fatigue and work schedules
  2. Hypobaric pressure
  3. Introduction to the Physical Agents Documentation
  4. Personal physiologic monitoring

Tier 2 (will not move forward with an NIC proposal in 2019) 

  1. Optical Radiation
    • Light and near infrared radiation

Other Issues Under Study

  1. Sensory induced motion sickness
  2. Head supported mass & neck loading (added 6-5-18)