ACGIH Releases Two-Tier "Under Study" List

Published July 30, 2014

Last week, ACGIH announced the release of its two-tier “Under Study” list, which includes chemical substances and physical agents to be considered for Threshold Limit Values (TLVs®) for Chemical Substances and Physical Agents and Biological Exposure Indices (BEIs®). TLVs and BEIs are health-based values derived from ACGIH’s conclusions of the exposure levels that typical workers can experience without adverse health effects. According to ACGIH, BEIs are guidance values for assessing biological monitoring results, and most BEIs are based on a direct correlation with the TLV, although some are instead directly related to the development of an adverse health effect.

ACGIH has presented its Under Study list in two tiers since 2006. Tier 1 entries indicate chemical substances and physical agents for which ACGIH might issue a Notice of Intended Change (NIC) or Notice of Intent to Establish (NIE) the following year. NICs and NIEs represent additional steps toward the issuance of a TLV or BEI. Tier 2 entries are substances and agents for which ACGIH will not issue an NIE or NIC in the following year. The updated list is available on ACGIH’s website.

ACGIH will next update the list by February 1, 2015.

For more information, read ACGIH’s press release.