TLV-PA Under Study

Physical Agents Under Study (TLV-PA Committee)

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 2022)

  1. Acoustic
    • Infrasound and Low-frequency sound (added 7/1/2021)
    • Audible sound
  2. Optical Radiation
    • Lasers (added 7/1/2021)
  3. Ionizing Radiation (added 7/1/2021)
  4.  Ergonomics
    • Lifting (added 7/1/2021)
    • Over shoulder work (added 7/1/2021)
  5. Thermal Stress
    • Heat stress and strain
    • Cold stress

Other Issues Under Study

  1. Fatigue and its management in the workplace

Tier 2 (will not move forward with an NIC proposal in 2022)

  1. Optical Radiation
    • Light and near-infrared radiation
  2. Ergonomics
    • Hand–arm vibration
    • Push/Pull (added 7/1/2021)

Other Issues Under Study

  1. Head supported mass and neck loading
  2. Hyperbaric pressure (added 7/1/2021)
  3. Hypobaric pressure
  4. Sensory-induced motion sickness (added 7/1/2021)