Toxicity Standards

The Toxicity (TWA and STEL) data quoted in the pure gas PDF files are taken from the National Occupational Health and Safety Council (NOHSC) of Australia document :

Exposure Standards for Atmospheric Contaminants in the Occupational Environment. 

Guidance Note 
[(NOHSC: 3008(1996)] 

and 

National Exposure Standards 
[NOHSC: 1033(1995)]

This document may be obtained from here

The determination of toxicity as expressed in terms of a compound’s LC50 (Lethal concentration for 50%). The method and data are provided in:

International Standard ISO 10298 1995(E) “Determination of toxicity of a gas or gas mixture.