No Observable Adverse Effect Level NOAEL

Meaning, Term, and Glossary Definition - What is No Observable Adverse Effect Level NOAEL?

An exposure level at which there are no statistically or biologically significant increases in the frequency or severity of adverse effects between the exposed population and its appropriate control; some effects may be produced at this level, but they are not considered as adverse, or as precurors to adverse effects. In an experiment with several NOAELs, the regulatory focus is primarily on the highest one, leading to the common usage of the term NOAEL as the highest exposure without adverse effects.

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Related glossary terms:

Action Levels   Acute Effect   Adverse Effects Data   A-Scale Sound Level   Background Level   BACT Best Available Control Technology   Best Available Control Technology BACT   Best Demonstrated Available Technology BDAT   Biologically Effective Dose   Biotechnology   
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