Over 170 million Americans were exposed to high amounts of lead as children, researchers say—enough to affect their cognition in later life.
To do this, they analyzed historical data on how much lead Americans were exposed to as children, based on population surveys, as well as data on levels of leaded gasoline use throughout the country over the years. Lead in gasoline becomes aerosolized and is breathed in through car exhaust, and it can also contaminate the surrounding soil and environment.
Ultimately, they concluded that just about half of the American population alive in 2015 likely had worrying levels of lead exposure growing up. From there, they calculated the effect that this lead exposure had on people’s cognition, using IQ as a proxy. Overall, they estimated that childhood lead exposure in the U.S. resulted in a collective drop of 824 million IQ points, or almost three points on average per person.
Though much has been done to reduce the presence of lead in our environment, lead exposure remains a pressing public health issue even today. Many drinking water supplies across the U.S. to be laced with lead—a problem most infamously exemplified by the Flint water crisis in 2014. Worldwide, the problem is even worse,in 2019, including from causes like heart disease and strokes.’s likely that the ramifications of lead poisoning will follow people decades down the road as well,say.
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