The Contribution of Lead-Contaminated House Dust and Residential Soil to Children's Blood Lead Levels

TLDR

In 1992, the U.S. Congress enacted the Residential Lead‑Based Paint Hazard Reduction Act, mandating health‑based dust and soil lead standards to protect children, yet the specific dust and soil lead levels that elevate blood lead remain poorly defined. This pooled analysis estimates how lead‑contaminated house dust and soil contribute to children’s blood lead levels and can inform the health impact of alternative residential lead standards. The study combined data from multiple epidemiologic investigations to quantify the contributions of dust and soil lead to blood lead levels.

Abstract

In 1992, the U.S. Congress passed the Residential Lead-Based Paint Hazard Reduction Act, which requires the promulgation of health-based dust lead and soil lead standards for residential dwellings to prevent undue lead exposure in children. Unfortunately, the levels of lead in house dust and soil that are associated with elevated blood lead levels among U.S. children remain poorly defined. This pooled analysis was done to estimate the contributions of lead-contaminated house dust and soil to children's blood lead levels. The results of this pooled analysis, the most comprehensive existing epidemiologic analysis of childhood lead exposure, confirm that lead-contaminated house dust is the major source of lead exposure for children. These analyses further demonstrate that a strong relationship between interior dust lead loading and children's blood lead levels persists at dust lead levels considerably below the U.S. Department of Housing and Urban Development's current postabatement standards and the Environmental Protection Agency's guidance levels. Finally, these analyses demonstrate that a child's age, race, mouthing behaviors, and study-site specific factors influence the predicted blood lead level at a given level of exposure. These data can be used to estimate the potential health impact of alternative health-based lead standards for residential sources of lead exposure.