Concentration limits
Concentration limits – or exposure limit values - most commonly used in Civil Protection are: AEGL, ERPG, IDLH and ETW.
Glossary Source
JRC EU CBRNe Glossary
(
EU Glossary on Chemical, Biological, Radiological, Nuclear, and Explosive risks
)
https://publications.jrc.ec.europa.eu/repository/bitstream/JRC128863/JRC128863_01.pdf