no-response level

initialism: NRL
https://doi.org/10.1351/goldbook.14886
Maximum dose of a substance at which no specified response is observed in a defined population and under defined conditions of exposure.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 921 [Terms] [Paper]