The World Health Organization says that lead blood levels of 100 micrograms per liter and above (or 10 micrograms per deciliter, using the measurement standard more common in the U.

• 世界卫生组织(WorldHealthOrganization)称，儿童血铅含量超过每升100微克（美国中常用的衡量标准是每分升10微克）就可能带来危害。