Request for Comment on the Draft Immediately Dangerous to Life or Health (IDLH) Value Profile Document for Lewisite

The National Institute for Occupational Safety and Health (NIOSH) in the Centers for Disease Control and Prevention (CDC), an Operating Division of the Department of Health and Human Services (HHS), requests public comment on the draft Immediately Dangerous to Life or Health (IDLH) Value Profile document for the chemical lewisite (CAS# 541-25-3). NIOSH develops IDLH values for workplace chemical concentrations and conditions carrying immediate, unacceptable health risks. IDLH values are based on health effects considerations determined through a critical assessment of toxicology and human health effects data.

To view the notice and related materials, visit https://www.regulations.gov  and enter CDC-2019-0093 in the search field and click “Search.”

Public Comment Period

Public Comment Period

Comments will be accepted until 11:59 p.m. ET on May 18,2026.

Written comments, identified by CDC-2019-0093 and docket number NIOSH-156-E, may be submitted by any of the following methods:

• Federal rulemaking portal: Follow the instructions for submitting comments.

Instructions: All submissions received must include the agency name and docket number. All relevant comments, including any personal information provided, will be posted without change to https://www.regulations.gov

• Mail: NIOSH Docket Office
  1090 Tusculum Avenue
  MS-C34
  Cincinnati, OH 45226