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Step
1.5 Using Comparison Values
Introduction
Comparison values are doses (termed health guidelines) or substance concentrations (termed environmental guidelines) set well below levels that are known or anticipated to result in adverse health effects. Comparison values are derived from
scientific studies and modified by safety factors to be more protective
of human health.
ATSDR's comparison values are developed for a specific chemical in each
of three environmental media: air, soil, and drinking water. If a chemical
is found at a level above the comparison value and people can contact
the chemical, the health assessor selects the chemical for further evaluation.
Also, if a chemical is found that people can contact, but there is no
comparison value for that chemical, it is selected for further evaluation.
Chemicals found at levels below comparison values are not selected.
Click on the headings below or on the View All link to see what comparison
values are and are not.
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