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In public health, a situation that threatens life, personal, and population health and safety, human settlements, habitat, generally associated with environmental change from equilibrium to an unbalanced state. It is usually sudden in onset but may develop gradually. Examples include floods, hurricanes, earthquakes, droughts, and manmade situations, such as violent armed conflict, that require intervention to restore stability. See also disaster.

Subjects: Environmental Science — Public Health and Epidemiology.

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