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Exposure to Lead can Impact Fertility Rates

by Sushma Rao on May 23, 2018 at 12:56 PM
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Exposure to Lead can Impact Fertility Rates

Exposure to lead (in the air and topsoil) can affect fertility in both men and women, finds a recent study. The study was a first that comes after news evidence of lead contamination in the water supply in Flint, Michigan in the United States The study looked at fertility rates of men and women in the 1980s and mid-2000s.

The study, by researchers at Carnegie Mellon University, is published as a working paper by the National Bureau of Economic Research.

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"Until now, we have lacked causal evidence of the effects of lead exposure," explains Karen Clay, professor of economics and public policy at Carnegie Mellon University's Heinz College of Information Systems and Public Policy, who led the study. "While many people have been focused on lead in water because of Flint or lead in paint because of public service campaigns, lead in the air and in the soil also deserves significant attention. Lead is an underappreciated environmental toxin, and we need to address this issue through cleanup efforts and solutions that focus on improving air quality and reducing lead in soil."

The researchers looked at U.S. Vital Statistics data on fertility, Environmental Protection Agency data for 1978-88 for airborne lead (covering more than a third of the U.S. population), and U.S. Geological Survey data in the 2000s on lead in topsoil (covering more than two-thirds of the U.S. population).
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The study found that increased exposure to lead lowered the general fertility rate for women of childbearing age (15 to 44 years). In 1978-88, reductions in airborne lead, which were largely due to regulations such as the Clean Air Act, boosted fertility rates, and in the 2000s, higher levels of lead in topsoil decreased fertility rates.

"Because fertility has implications for economic activity, factors that decrease fertility are of significant policy concern, as well as of concern to individuals and society," explains Edson Severnini, assistant professor of economics and public policy at Heinz College, who coauthored the paper. "Lead may continue to impair fertility today: Many Americans may not be aware that they live in counties with high lead levels because of highways, old manufacturing centers, or airborne lead that has landed on the soil. Our findings could help reduce this exposure."



Source: Eurekalert
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