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- An incident that is prevented at the last moment or is narrowly avoided.
- Any unplanned event which, but for the mitigation effects of safety systems or procedures, could have caused harm to health, the environment or property, or could have involved a loss of containment possibly giving rise to adverse effects involving hazardous substances.
- Reference: OECD Environment, Health and Safety Publications Series on Chemical Accidents No. 10, Annex 1, 2nd Ed., 2003.