A population subgroup that is more likely to be exposed to a chemical, or is more sensitive to the chemical, than is the general population.
The population potentially affected by flood waters as a result of large operational releases or dam failure. The potential number of persons whose lives are at risk in the event of a dam failure.
The population at risk is the population that is exposed to the occurrence of a vital event, for example, the total population in the case of deaths, the legally married population in the case of divorces and so on.
Population at Risk has been defined 6 different ways in documents like FRTR Glossary, Glossary of Humanitarian Terms, Reclamation Glossary, and 3 more.