ExposureLimit

https://ontology.toxindex.com/v1/ExposureLimit Exposure

A level of a substance that an authority sets as a limit or guidance value for exposure: an occupational limit, an emergency exposure guideline, a tolerable or reference intake, or a permitted concentration in air, water, or soil. What the value measures — a concentration in air, a dose per body weight per day, a concentration in water — is carried by its unit, and the exposure it applies to by its exposure. A limit is a judgment made by someone, so its citations record where it came from; limits from different authorities coexist. A limit imposed by a regulation names that policy; a limit with no policy is advisory.

Relationships

References

substance Substance

limit Quantity

expressed_as Substance

policy Policy

exposure Exposure

citations Citation []

Properties

Class properties with name, type, requirements, and description
Name	Type		Description
`substance`	Substance	required	The substance a classification or listing applies to.
`limit`	Quantity	required	The value of an exposure limit, with its unit.
`expressed_as`	Substance		The substance a limit's mass is expressed as, when it is stated in terms of an element or ion rather than the whole substance, such as milligrams of fluoride per cubic metre.
`severity`	SeverityEnum		The severity of effect a limit marks the threshold of, for limits set in tiers of increasing severity. Absent for limits set at a single level.
`policy`	Policy		The policy that names a substance.
`exposure`	Exposure		The exposure a limit applies to.
`citations`	Citation []	required	Where a value came from.