The researchers estimate that childhood lead levels at or above 5 micrograms per deciliter of blood accounted for as many as 25 percent of the children in the study failing reading and math standardized tests. (sciencenews.org)
«Back in 1992, New York State set a blood level at 10 micrograms per deciliter of blood as the action level — child tested at 10, the public health people would spring into action to ensure they were fully evaluated,» remarked Ryan. (news.wbfo.org)
In 1991, the Centers for Disease Control set a federal standard of 10 micrograms of lead per deciliter of blood. (scientificamerican.com)