The estimated contaminant concentration in a specific medium that is not likely to cause adverse health effects, given a standard daily ingestion rate and standard body weight. Comparison values are calculated from the scientific literature available on exposure and health effects.
Concentrations or the amount of substances in air, water, food, and soil that are unlikely to cause adverse health effects upon exposure. Comparison values are used to select which substances and environmental media (air, water, food and soil) need additional evaluation to determine if adverse effects from an exposure are possible.
A concentration of a chemical in soil, air, or water that, if exceeded, requires further evaluation as a contaminant of potential health concern. The terms comparison value and screening level are often used synonymously.
Media-specific screening chemical concentrations developed by the Agency for Toxic Substances and Disease Registry that are used by health assessors to select environmental contaminants for further evaluation.
Estimated chemical concentrations in specific environmental media that are not likely to cause adverse health effects considering exposure for a specified duration. The comparison values are calculated from scientific literature available on exposure and health effects. The Agency for Toxic Substances and Disease Registry, Environmental Protection Agency, and many state governments have calculated comparison values to use for health assessments and risk assessments.
Concentrations or the amount of substances in air, water, food, and soil that are unlikely, upon exposure, to cause adverse health effects. Comparison values are used by health assessors to select which substances and environmental media (air, water, food and soil) need additional evaluation while health concerns or effects are investigated.
Calculated concentration of a substance in air, water, food, or soil that is unlikely to cause harmful (adverse) health effects in exposed people. The CV is used as a screening level during the public health assessment process. Substances found in amounts greater than their CVs might be selected for further evaluation in the public health assessment process.
