Air Pollution Linked to Brain Abnormalities in Children

A new study performed in the Netherlands has linked exposure to residential air pollution during fetal life with brain abnormalities that may contribute to impaired cognitive function in school-age children. (Image: alvpics via Pixabay)

A new study performed in the Netherlands has linked exposure to residential air pollution during fetal life with brain abnormalities that may contribute to impaired cognitive function in school-age children. The study, published in Biological Psychiatry, reports that the air pollution levels related to brain alterations were below those considered to be safe.

“We observed brain development effects in relationship to fine particles levels below the current EU limit,” said lead author Mònica Guxens, M.D., of Barcelona Institute for Global Health (ISGlobal), Spain, a center supported by the “la Caixa” Foundation, and Erasmus University Medical Center, the Netherlands.

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This finding adds to previous studies that have linked acceptable air pollution levels with other complications including cognitive decline and fetal growth development. “Therefore, we cannot warrant the safety of the current levels of air pollution in our cities,” said Dr. Guxens.

Exposure to fine particles during fetal life was associated with a thinner outer layer of the brain, called the cortex, in several regions. The study showed that these brain abnormalities contribute in part to difficulty with inhibitory control — the ability to regulate self-control over temptations and impulsive behavior — which is related to mental health problems, such as addictive behavior and attention-deficit/hyperactivity disorder.

The study used a population-based cohort in the Netherlands, which enrolled pregnant women and followed the children from fetal life onward. Dr. Guxens and colleagues assessed air pollution levels at home during the fetal life of 783 children.

The data were collected by air pollution monitoring campaigns, and included levels of nitrogen dioxide (a prominent air pollutant caused by traffic and cigarette smoking), coarse particles, and fine particles.

Brain imaging performed when the children were between 6 and 10 years old revealed abnormalities in the thickness of the brain cortex of the precuneus and rostral middle frontal region.

Despite the relationship between these brain structure alterations and fine particle exposure, the average residential levels of fine particles in the study were well below the current acceptable limit set by the EU — only 0.5 percent of the pregnant women in the study were exposed to levels considered unsafe.

The average residential levels of nitrogen dioxide were right at the safe limit. John Krystal, M.D., Editor of Biological Psychiatry said:

Fetal brain particularly vulnerable to impact of air pollution

The fetal brain is particularly vulnerable during pregnancy — it hasn’t yet developed the mechanisms to protect against or remove environmental toxins. The findings of the study suggest that exposure to levels even below those considered safe could cause permanent brain damage.

Provided by: Elsevier [Note: Materials may be edited for content and length.]

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