Americans born before 1996 may have a lower IQ from exposure to leaded gasoline, study finds. Here’s why.
Health experts say the effects of leaded gasoline in cars, although banned since 1996, still linger today after a new study found Americans exposed to the highly toxic metal may have a lower IQ.
Researchers at Duke University and Florida State University analyzed publicly available data on U.S. childhood blood-lead levels, leaded-gas use and population statistics and determined the likely lifelong burden of lead exposure carried by every American alive in 2015.
They found more than 170 million Americans – more than half of the U.S. population – had “clinically concerning” levels of lead in their blood when they were children, according to the study published Monday in Proceedings of the National Academy of Sciences.
They estimated this level of lead exposure may have lowered a person’s IQ by an average of three points, which is a total of about 824 million points among all Americans exposed to lead.