Air and water pollutants are linked to changes in the human sex ratio at birth (SRB)—the ratio between the number of newborn boys to the total number of newborns—according to a study of U.S. and Swedish populations.
Researchers at the University of Chicago and Karolinska Institutet, Stockholm, found an association between numerous pollutants and changes to the ratio of boys to girls, but did not establish a causal relationship in their study, titled “Observable variations in human sex ratio at birth.”
