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The most critical health effect of lead exposure is the neurodevelopmental effect to children caused by the increased bloodlead level. Therefore, the endpoint of the risk assessment for lead-contaminated sites should be set at the blood lead levelof children. In foreign countries, the risk assessment for lead-contaminated sites is conducted by estimating the increasedblood lead level of children via oral intake and/or inhalation (United States Environmental Protection Agency, USEPA), orby comparing the estimated oral dose to the threshold oral dose of lead, which is derived from the permissible blood leadlevel of children (Dutch National Institute for Public Health and the Environment, RIVM). For the risk assessment,USEPA employs Integrated-Exposure-Uptake-Biokinetic (IEUBK) Model to check whether the estimated portion ofchildren whose blood lead level exceeds 10µg/dL, threshold blood lead level determined by USEPA, is higher than 5%,while Dutch RIVM compares the estimated oral dose of lead to the threshold oral dose (2.8µg/kg-day), which is derivedfrom the permissible blood lead level of children. In Korea, like The Netherlands, risk assessment for lead-contaminatedsites is conducted by comparing the estimated oral dose to the threshold oral dose; however, because the threshold oraldose listed in Korean risk assessment guidance is an unidentified value, it is recommended to revise the existing thresholdoral dose described in Korean risk assessment guidance. And, if significant lead exposure via inhalation is suspected, it isuseful to employ IEUBK Model to derive the risk posed via multimedia exposure (i.e., both oral ingestion and inhalation).Key words : Lead, Risk Assessment, Blood lead level

Analysis on the Risk-Based Screening Levels Determined by Various Risk Assessment Tools (III): Proposed Methodology for Lead Risk Assessment in Korea