However, like many other broadly distributed tests, a myriad of factors determine a persons IQ score.
As a result, they lost a total estimate of 824 million IQ points since the 1940s.
There is no longer lead in our gasoline, but a large percentage of US water pipes contain lead.
Catherine Falls Commercial / Getty Images
They discovered lead, a natural, now understood to be toxic, metal was the answer.
Thanks to the Clean Air Acts passage, this reliance on leaded gas began to change in 1970.
They were equipped with catalytic convertersa feature lead would damage.
Lead is a metal and chemical element that is found naturally in the environment.
Unlike many other elements, lead has no biological role in the human body, saysDr.
Kelly Johnson-Arbor, medical toxicologist and co-medical director of the National Capital Poison Center.
Instead, lead acts as a toxin.
Certain people have a higher risk associated with lead exposure.
It can also cause children to have hypertension, enter a coma, experience convulsions, or pass away.
Because of this, many states require that all children undergo blood testing at a young age.
Currently, a blood lead level of 3.5 mcg/dL is the accepted threshold limit for blood lead in children.
Low- and middle-income countries felt the brunt of this issue.
These factors are critical to keep in mind when looking at leads impact on IQ points.
Its also necessary to look at the disparities in lead exposure.
If you believe you or another person has lead poisoning, callPoison Control: 1-800-222-1222.
2022;119(11):e2118631119.
doi:10.1073/pnas.2118631119
Environmental and Energy Study Institute.A brief history of octane in gasoline: From lead to ethanol.
United Nations.End of leaded fuel use a ‘milestone for multilateralism’.
Centers for Disease Control and Prevention.Lead.
World Health Organization.Lead poisoning.
