Although significant declines have been observed in the overall mean blood lead levels of children, which can be attributed to Federal Government actions resulting in the removal of lead from gasoline and
soldered cans, approximately 1.7 million children are estimated to have blood lead levels high enough to be of a health concern. Lead poisoning affects children across all socioeconomic strata and in all regions of the country. However, because lead-based paint hazards are most severe in older housing in disrepair, the poor in inner cities are disproportionately affected. In some inner city communities, over half of all young children have lead levels exceeding the CDC threshold of concern (10 micrograms per deciliter).
Today, children in the United States are lead poisoned primarily through ingestion by normal hand-to-mouth activity and, to a lesser extent, inhalation. Because lead is ubiquitous in industrial societies,
there are many sources and pathways of lead exposure. The foremost source of childhood lead exposure in the United States today is lead based paint and the accompanying lead-contaminated dust and soil found in and around older houses.
Lead was a major ingredient in most interior and exterior house oil-based paints prior to 1950, with some paints containing as much as 50 percent lead by dry weight. In the early 1950s, other ingredients became more popular, but some lead pigments, corrosion inhibitors, and drying agents were still used.
In the 1950's and 1960's, several large cities in the United States banned the use of lead-based paint (using varying definitions) on interior surfaces in residential structures. In 1955, the paint industry adopted a voluntary standard limiting the use of lead in interior paints to no more than 1 percent by weight of nonvolatile solids. three-quarters of pre-1980 dwelling units contain some lead-based paint. The likelihood, extent, and concentration of lead-based paint all increase with the age of the building. Fully 90 percent of privately owned dwelling units constructed before 1940 contain some lead-based paint, 80 percent of dwelling units constructed between 1940 and 1959, and 62 percent of dwelling units constructed between 1960 and 1979 (``Comprehensive and Workable Plan for the Abatement of Lead-Based Paint in Privately-Owned Housing.
Children can also be exposed to lead found in bare soil. High levels of lead in soil around the foundation of a house may come from the scraping and repainting of exterior lead-based paint or simply the
deterioration of such paint.Office of Lead-Based Paint Abatement and Poisoning Prevention; Requirements for Notification, Evaluation and Reduction of Lead-Based Paint Hazards in Federally Owned Residential Property and Housing Receiving Federal Assistance.
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