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One study suggests that pregnant women who live near a main road are more likely to have slow children to learn slowly.
Tots exposed to higher levels of pollution in the uterus took longer to develop key communication skills and movements.
Alamy
They also failed to demonstrate their problem-solving skills and their sense of social awareness until older age.
The researchers badyzed data for 5,825 children, who were tested every four to six months, from eight months to three years.
This included noting if they could perform certain tasks such as saying "mom", putting things in a box and hugging a stuffed animal.
The tests varied each time to ensure they were age-appropriate but covered communication, movement, social skills and problem solving.
Officials at the University of California also recorded pollution incidents at the personal addresses of young people and at the workplace of nurseries and mothers.
We found that living closer to a major roadway during pregnancy or early life increased the risk of developmental delay in childhood.
Dr. Sandie Ha, Head of Study
Children living less than one kilometer from a main road were twice as likely to pbad a communication test as those living more than one kilometer away.
The exposure to a high level of ultrafine particles before birth increased by 2.7% the risk of failure to one of the tests.
In addition, high exposure to ozone during early childhood increased the risk of failure of the badessment by 17.7%.
Ultrafine particles, called PM2.5, and ozone are pumped into the exhaust gases of vehicles.
Previous studies have linked exposure to common air pollutants during pregnancy with low birth weight, premature births, and stillbirths.
These toxins are believed to enter the bloodstream and the brain, where they can impede mental development.
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Dr. Sandie Ha, head of the study, said, "We found that living closer to a main road during pregnancy or at the beginning of life increased the risk of developmental delay. in childhood.
"Efforts to minimize exposure to air pollution during critical periods of development could be justified."
The results are published in the journal Environmental Research.
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