WES review - Immediately dangerous to life or health notation


Download PDF - 589.31 KB
Download DOCX - 132.92 KB

This document is about a new notation for ‘immediately dangerous to life or health’ (IDLH) in the workplace exposure standards (WES).  

An IDLH notation will indicate an airborne chemical concentration that can either: 

  • cause death  

  • cause immediate or delayed permanent adverse health effects to a worker 

  • impede a worker’s escape from such an environment. 

You can find more information in: 


Publication Date:

Publication type:



Hazardous chemicals
Managing health and safety
The work environment
Workplace exposure standards for chemicals