Terminology Services

Integrated Risk Information System (IRIS) Glossary

Description:

This glossary contains definitions of terms used frequently in IRIS Program assessments and related materials. These definitions assumed that the user has some familiarity with risk assessment and health science.

Publishing Organization:

Office of Research and Development/Center for Public Health and Environmental Assessment/Chemical and Pollutant Assessment Division

Last Update:

June 22, 2022

Program Site:

https://www.epa.gov/iris

Terms & Acronyms

Search Terms (Contains): NOAEL

	Term
	No-Observed-Adverse-Effect Level	Definition: The highest exposure level at which there are no biologically significant increases in the frequency or severity of adverse effect between the exposed population and its appropriate control; some effects may be produced at this level, but they are not considered adverse or precursors of adverse effects. Acronym: NOAEL

Export options: Excel | XML | PDF | RTF