Introduction evaluation is the way toward assessing or estimating the size, recurrence and length of presentation to a specialist, alongside the number and qualities of the populace uncovered. In a perfect world, it depicts the sources, pathways, courses, and the vulnerabilities in the appraisal.

Introduction investigation is the science that portrays how an individual or populace interacts with a contaminant, including evaluation of the measure of contact across existence. 'Introduction appraisal' and 'presentation investigation's are regularly utilized as equivalents in numerous useful settings. Hazard is a component of introduction and risk. For instance, in any event, for an incredibly harmful (high peril) substance, the danger of an unfriendly result is far-fetched if exposures are close to zero. Then again, a reasonably harmful substance may introduce significant hazard if an individual or a populace is exceptionally uncovered.