Abstract
Lead (Pb) is extremely toxic and a major cause of chronic diseases worldwide. Pb is associated with health disparities, particularly within low-income populations. In biological systems, Pb mimics calcium and, among other effects, interrupts cell signaling. Furthermore, Pb exposure results in epigenetic changes that affect multigenerational gene expression. Exposure to Pb has decreased through primary prevention, including removal of Pb solder from canned food, regulating lead-based paint, and especially eliminating Pb additives in gasoline. While researchers observe a continuous decline in children’s blood lead (BPb), reservoirs of exposure persist in topsoil, which stores the legacy dust from leaded gasoline and other sources. Our surveys of metropolitan New Orleans reveal that median topsoil Pb in communities (n = 274) decreased 44% from 99 mg/kg to 54 mg/kg (P value of 2.09 × 10−08), with a median depletion rate of ∼2.4 mg⋅kg⋅y−1 over 15 y. From 2000 through 2005 to 2011 through 2016, children’s BPb declined from 3.6 μg/dL to 1.2 μg/dL or 64% (P value of 2.02 × 10−85), a decrease of ∼0.2 μg⋅dL⋅y−1 during a median of 12 y. Here, we explore the decline of children’s BPb by examining a metabolism of cities framework of inputs, transformations, storages, and outputs. Our findings indicate that decreasing Pb in topsoil is an important factor in the continuous decline of children’s BPb. Similar reductions are expected in other major US cities. The most contaminated urban communities, usually inhabited by vulnerable populations, require further reductions of topsoil Pb to fulfill primary prevention for the nation’s children.
Funder
HHS | CDC | Agency for Toxic Substances and Disease Registry
U.S. Department of Housing and Urban Development
Publisher
Proceedings of the National Academy of Sciences
Reference98 articles.
1. C. C. Patterson , “An alternative perspective-lead pollution in the human environment: Origin, extent, and significance” in Lead in the Human Environment, Committee on Lead in the Human Environment, Ed. (National Academy of Sciences, Washington, DC, 1980), pp. 265–349.
2. Human exposure to lead and new evidence of adverse health effects: Implications for analytical measurements;Parsons;Int. Cent. Diffr. Data,2010
3. Deficits in Psychologic and Classroom Performance of Children with Elevated Dentine Lead Levels
4. New information on lead in dirt and dust as related to the childhood lead problem;Haar;Environ. Health Perspect.,1974
5. Soil is an important pathway of human lead exposure.
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