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Scientists know that lead exposure during childhood harms the developing brain and nervous system, but it is not clear if childhood lead exposure has long-lasting effects on adult brain function. Changes in adult intelligence quotients â IQs â is a way to measure effects of lead and other neurotoxic substances.
One estimate of the relationship between ambient airborne lead levels and the cardiovascular impacts of lead in adults - including hypertension, heart attacks and premature deaths - concludes that a 1Î¼g/m3 increase in ambient lead concentrations was estimated to cause 44,800 to 97,000 cases of hypertension per 1 million males between the ages of 20 and 70, 180-500 nonfatal heart attacks and 200-650 premature deaths per 1 million males between the ages of 40 and 59.