Definition(s)
NOAEL
NOAEL is the highest concentration at which no adverse physiological or toxicological effect has been observed.
Source: IMO MSC.1/Circ.1316, Guidelines on determining the no observed adverse effect level (NOAEL) and lowest observed adverse effect level (LOAEL) values for halocarbon fire-extinguishing agents, 10 June 2009, International Maritime Organization. Regulatory Guidance