铅是一种对人体有神经毒性的重金属元素,铅中毒可对神经、造血、内分泌和泌尿系统造成损害[1],也会造成儿童认知能力的下降[2]。学龄前儿童是铅中毒的高危人群,造成学龄前儿童血铅升高的原因仍不明确。本研究旨在了解北京市顺义区3~7岁学龄前儿童血铅水平的分布情况,探讨影响学龄前儿童血铅水平的危险因素,为采取有效措施减少儿童铅中毒发生提供理论依据。对象与方法1.一般资料:按公路主干道旁、工业园区旁、中 Lead is a heavy metal element that is neurotoxic to humans. Lead poisoning can cause damage to nerves, hematopoiesis, endocrine and urinary systems [1] and can lead to a decline in children’s cognitive ability [2]. Preschool children are at high risk of lead poisoning, causing pre-school children with elevated blood lead is still not clear. This study aimed to understand the distribution of blood lead levels in preschool children aged 3 to 7 years in Shunyi District of Beijing and to explore the risk factors affecting blood lead levels in preschool children and provide a theoretical basis for effective measures to reduce lead poisoning in children. Objects and methods 1. General information: By road next to the main road, next to the industrial park