Study: Air Pollution, Poverty Lowers Childrens’ IQ

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A Columbia University study shows links between low-income children exposed to pollution during pregnancy are high-risk for low IQs and other health issues.
A Columbia University study shows links between low-income children exposed to pollution during pregnancy are high-risk for low IQs and other health issues.

A Columbia University study predicts a probable gloomy future for children born into lower-income neighborhoods that had exposure to high levels of air pollution. Researchers found that growing children facing these two factors developed lower intelligence, reasoning ability and working memory.

The new observations were made through studying two groups of mother-child pairs. The study found that children exposed to air pollution during gestation are not only at a higher risk of developing physical symptoms like asthma, but more likely to score lower on full-scale intelligence tests as well.

In the paper from Columbia’s Mailman School of Public Health, researchers determined a correlation between children born to socioeconomic disadvantage, exposure to elevated levels of polycyclic aromatic hydrocarbons (PAH) and lower IQs. Because many young mothers in the study live within areas of elevated PAH and also experience material hardship, the policy implications of these findings are extremely numerous and troubling.

Especially in high-density cities, PAH in the environment are ubiquitous. The compounds are found in emissions from vehicles, tobacco smoke, oil, coal burning and other combustion.

The study followed 276 mother-child pairs from pregnancy through early childhood. One group of mothers self-identified material hardship both before giving birth and at several times afterward. Hardship is defined by an individual’s unmet basic needs and includes food, clothing and housing.

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Dr. Frederica Perera ( photo)

“Our participants were recruited from northern Manhattan and the South Bronx, areas that tend to have a lower-income population and which also tend to bear a disproportionate burden of air pollution as compared to more suburban and rural areas,” Dr. Frederica Perera, lead author of the paper and director of the Columbia Center for Children’s Environmental Health, told TheBlot Magazine via e-mail.

These new observations add further evidence to already-established research that connects children born into difficult socioeconomic situations with increased adverse effects from exposure to environmental stressors like air pollution, the authors found.

“At age 7, we found that among children who were highly exposed to PAH prenatally, those whose mothers had reported high material hardship had statistically significant reduced IQ,” Perera wrote. “Thus, our findings suggest that early-life exposure to air pollutants may interact with adverse socioeconomic conditions to affect cognitive development of children.”

The researchers previously found that children in the material hardship group showed developmental delay by age 3, reduced verbal ability and global intelligence at age 5 and signs of anxiety and depression by age 7. Then, at 7-years-old, they assessed the IQs of the children from both groups using the Wechsler Intelligence Scale for Children.

Before birth, the levels of PAH in the child through their mothers were assessed to gain a baseline score. These were compared to a control group that was not exposed to high levels of air pollution and additionally did not self-report material hardship. The findings revealed lower working memory in the prenatal and recurrent material hardship group. The same significant relationship was not found in the lower material hardship group.

Combatting this problem will be a long road that begins at the intersection of the environmental and social, which will be fought by policies that help poor areas. Perera noted that a multifaceted approach is needed to alleviate the burden this double-edged sword cuts into kids of lower-income neighborhoods.

“In terms of shaping policy, low-income communities should be the highest priority for reducing air pollution levels, as their susceptibility and risk is likely to be higher.” she wrote. “Ensuring clean, healthy air is really a responsibility of policymakers entrusted with the responsibility of protecting public health.”

Noah Zuss is a reporter for TheBlot Magazine.

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