According to national U.S.studies, in 1978 nearly __________ of children ages 5-10 had dangerously elevated levels of lead in their blood, which can cause brain damage; by 2001, the rate had fallen to __________.

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In 1978, nearly 30% of children ages 5-10 had dangerously elevated levels of lead in their blood, a significant public health concern. By 2001, through various interventions and the removal of lead from gasoline and paint, this rate had dramatically decreased to 1%.

According to National U