maximum tolerable exposure level (MTEL)

https://doi.org/10.1351/goldbook.M03770
Maximum amount or concentration of a substance to which an organism can be exposed without leading to an @AT06809@ after prolonged exposure time.
Source:
PAC, 1993, 65, 2003. (Glossary for chemists of terms used in toxicology (IUPAC Recommendations 1993)) on page 2068 [Terms] [Paper]