Reducing air pollution in New York City would result in substantial economic gains for children as a result of increasing their IQs. The study is the first to estimate the costs of IQ loss associated with exposure to air pollution, and is based on prior research on prenatal exposure to air pollutants among low-income children by Frederica Perera, PhD, lead author of the current study, and colleagues at the Columbia Center for Children’s Environmental Health at the Mailman School of Public Health.
The researchers made their calculation using a hypothesized modest reduction of .25 nanograms per cubic meter air (ng/m3) of ambient concentrations of polycyclic aromatic hydrocarbon (PAH), a family of chemicals created by burning fossil fuels that is ubiquitous in urban air. By way of comparison, the current estimated annual mean PAH concentration is approximately 1 ng/ m3. The analysis focused on the 63,462 New York City children born in 2002 to women on Medicaid, a group sharing the same socio-demographic characteristics as the cohort studied by Dr. Perera and colleagues linking IQ and PAH, and used methods employed in published studies estimating earnings potential related to exposures to lead and mercury. Gains in IQ related to the hypothetical 25% reduction in PAH translated to increased lifetime earnings of $215 million.
The researchers previously reported that children born to nonsmoking mothers exposed to higher levels of airborne PAH during pregnancy had IQs three points lower at age 5 than children whose mothers had lower PAH exposures. The IQ reduction was modest but in the range of that seen with low-level lead.
The researchers say they have likely underestimated the total economic benefit associated with reduction in prenatal PAH exposure because it does not include estimates of economic gains due to broader neurotoxic, respiratory, and carcinogenic effects, all also linked with PAH. While based on children born to mothers on Medicaid in New York City, the authors say, the results likely apply to children more broadly. IQ affects academic performance and earnings.
According to Dr. Perera, “Our analysis suggests that a modest reduction in urban air pollution would provide substantial economic benefits and help children realize their full potential.”
Past research by the Columbia Center for Children's Environmental Health has contributed evidence that pollution sources during the sensitive fetal and early childhood periods can result in adverse health, including: reduced fetal growth; impaired cognitive development; increased risk of obesity; and increased cancer risk.
Support for the current study was provided by the National Institute of Environmental Health Sciences grants (5P01ES09600, 5R01ES08977), US Environmental Protection Agency grants (R827027, RD832141, RD83450901), the John and Wendy Neu Family Foundation, the Blanchette Hooker Rockefeller Fund, and the New York Community Trust.
Katherine Weiland, Matthew Neidell, and Shuang Wang are co-authors of the report. None of the authors have financial relationships with a commercial entity that has an interest in the subject of this manuscript.
Full results are published in the Journal of Public Health Policy.
About Columbia University’s Mailman School of Public Health
Founded in 1922, Columbia University’s Mailman School of Public Health pursues an agenda of research, education, and service to address the critical and complex public health issues affecting New Yorkers, the nation and the world. The Mailman School is the third largest recipient of NIH grants among schools of public health. Its over 450 multi-disciplinary faculty members work in more than 100 countries around the world, addressing such issues as preventing infectious and chronic diseases, environmental health, maternal and child health, health policy, climate change & health, and public health preparedness. It is a leader in public health education with over 1,300 graduate students from more than 40 nations pursuing a variety of master’s and doctoral degree programs. The Mailman School is also home to numerous world-renowned research centers including ICAP (formerly the International Center for AIDS Care and Treatment Programs) and the Center for Infection and Immunity. For more information, please visit www.mailman.columbia.edu.