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. 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 2023)

Infrasound and Low-frequency sound
Lasers
Over shoulder work
Push/pull
Whole-body vibration

Tier 2 (will not move forward with an NIC proposal in 2023)

Optical Radiation
Audible sound
Cold stress
Electromagnetic fields
Hand activity
Hand-arm vibration
Head supported mass and neck loading

Hyperbaric pressure
Hypobaric pressure
Ionizing radiation
Lifting and carrying
Light and near infrared radiation
Personal physiological monitoring
Sensory-induced motion sickness