News | Science Selection Nov-Dec 2013 | Volume 121 | Issue 11-12
Small Changes, Big Impact: Exposure to Air Pollution and Reduced Lung Function in Children
Julia R. Barrett, MS, ELS, a Madison, WI–based science writer and editor, has written for EHP since 1996. She is a member of the National Association of Science Writers and the Board of Editors in the Life Sciences.
Citation: Barrett JR. 2013. Small changes, big impact: exposure to air pollution and reduced lung function in children. Environ Health Perspect 121:A341; http://dx.doi.org/10.1289/ehp.121-A341
Published: 1 December 2013
Related EHP Article
Epidemiological studies suggest that outdoor air pollution adversely affects children’s lung function, which may not only harm their health now but also increase their susceptibility to respiratory and cardiovascular disease in adulthood.1,2,3,4 Exposure to air pollutants in infancy is suspected to alter lung development, with potential long-term consequences.5 However, a new study in EHP encompassing exposures at birth and at school age found that decreases in lung function were associated only with recent exposure.6
Researchers analyzed data from five European cohort studies, which assessed exposure using a standardized method.7 The five cohort studies, conducted in Sweden, northern and southern Germany, the United Kingdom, and the Netherlands, were intended in part to study the development of asthma and allergies.
The studies measured lung function of participants at age 6 or 8 years and used questionnaires to collect information about the children, their homes and families, and numerous factors touching on lung health. Land-use regression models provided estimates of annual average concentrations of specific air pollutants at the children’s home addresses at two time points: when they were newborns (between 1994 and 1999) and when they underwent lung function testing 6 or 8 years later. These models were based on actual monitoring that occurred in 2008–2010, when the participants were adolescents.
The analyses of 5,921 children revealed small but significant associations between decreased lung function and higher estimated levels of pollution at the children’s home address at age 6–8, but not at their address as a newborn. This finding suggests that the recent exposures were the more critical to current lung function.
Based on two earlier studies that investigated exposure at more than one time point,8,9 an association between later lung function and early-life exposure might have been expected, says Ulrike Gehring, the study’s lead author and an assistant professor at the Institute for Risk Assessment Sciences, Utrecht University. However, she also highlights other evidence that the effects of air pollution on children’s lung function may be reversible.10,11
© Johner Images/Alamy
Although small, the changes reported in the current study could have a disproportionate impact on public health, says Gehring. “These small changes result in a considerable increase in the number of children with a clinically low lung function. Further, a lower lung function in childhood may predispose children for asthma and chronic obstructive pulmonary disease later in life,” she says.
Because exposure estimates were limited to children’s residences, they did not capture exposures that may have occurred elsewhere, such as at schools or child-care centers. The current investigation also could not pinpoint the specific effects of individual pollutants, nor could it reveal the mechanisms by which damage might occur.6
Nevertheless, the study solidly supports an association between air pollution and adverse effects on children’s lung function, according to Jonathan Grigg, a professor of pediatric respiratory and environmental medicine at the London School of Medicine and Dentistry, who was not involved in the study.
“Clearly, a big strength is that [the researchers] put a lot of effort into harmonizing their land-use regression model, which I think means that these data are robust—as robust as we can have, given what epidemiology can do,” says Grigg. “However, we’re sort of at the limit of what we can do with epidemiology, using big numbers, large-scale studies, modeling exposure, and trying to look at the independent effects of pollutants.”
Previous studies have suggested that oxidative stress and inflammation are the primary mechanisms by which ambient air pollution induces adverse health effects. These mechanisms may also be relevant to lung function, but toxicological evidence is sparse, and very limited animal data exist. Smaller studies in which individual exposure is measured in more detail and linked with lung function may be the next phase in this area of research, according to Grigg. He says animal models could demonstrate causality between exposure and effect, with the caveats that lung growth differs among species, and such studies are expensive and complex.
Gehring says children in the current analysis are still being tracked. Most of the cohort studies have followed up at ages 10–12 and 16 years, and the teams plan to follow the children into adulthood. This will allow them to explore questions such as whether deficits in lung function in adolescence set the stage for reduced lung function in adulthood.12
1. Grigg J. Particulate matter exposure in children: relevance to chronic obstructive pulmonary disease. Proc Am Thorac Soc 6(7):564–569 (2009); http://dx.doi.org/10.1513/pats.200905-026RM.
2. Grigg J. Traffic-derived air pollution and lung function growth. Am J Respir Crit Care Med 186(12):1208–1209 (2012); http://dx.doi.org/10.1164/rccm.201210-1892ED.
3. Götschi T, et al. Long-term effects of ambient air pollution on lung function: a review. Epidemiology 19(5):690–701 (2008); http://dx.doi.org/10.1097/EDE.0b013e318181650f.
4. Sin DD, et al. The relationship between reduced lung function and cardiovascular mortality: a population-based study and a systemic review of the literature. Chest 127(6):1952–1959 (2005); http://dx.doi.org/10.1378/chest.127.6.1952.
5. Kajekar R. Environmental factors and developmental outcomes in the lung. Pharmacol Ther 114(2):129–145 (2007); http://dx.doi.org/10.1016/j.pharmthera.2007.01.011.
6. Gehring U, et al. Air pollution exposure and lung function in children: the ESCAPE Project. Environ Health Perspect 121(11–12):1357–1364 (2013); http://dx.doi.org/10.1289/ehp.1306770.
7. ESCAPE—European Study of Cohorts for Air Pollution Effects [website]. Utrecht, The Netherlands:European Study of Cohorts for Air Pollution Effects (updated 18 May 2009). Available: http://www.escapeproject.eu [accessed 25 October 2013].
8. Oftedal B, et al. Residential outdoor air pollution and lung function in schoolchildren. Epidemiology 19:129–137 (2008); http://dx.doi.org/10.1097/EDE.0b013e31815c0827.
9. Schultz E, et al. (2012) Traffic related air pollution and lung function in children at 8 years of age: a birth cohort study. Am J Respir Crit Care Med 186(12):1286–1291 (2012); http://dx.doi.org/10.1164/rccm.201206-1045OC.
10. Avol EL, et al. Respiratory effects of relocating to areas of differing air pollution levels. Am J Respir Crit Care Med 164(11):2067–2072 (2001); http://dx.doi.org/10.1164/ajrccm.164.11.2102005.
11. Rojas-Martinez R, et al. Lung function growth in children with long-term exposure to air pollutants in Mexico City. Am J Respir Crit Care Med 176(4):377–384 (2007); http://dx.doi.org/10.1164/rccm.200510-1678OC.
12. Gauderman WJ, et al. The effect of air pollution on lung development from 10 to 18 years of age. N Engl J Med 351(11):1057–1067 (2004); http://dx.doi.org/10.1056/NEJMoa040610.
EHP is pleased to launch its new Children’s Health page. This dynamic page will feature timely children’s health research and news as they are published in EHP as well as links to related material. The page includes its own “Search Children’s Health” function so visitors can search our full library of children’s health content by topic, author, or publication year and find exactly the information they need. Bookmark the page or access it via the “Featured Children’s Health” section on EHP’s home page. (more…)
EHP is proud to announce that “Polychlorinated Biphenyl and Organochlorine Pesticide Concentrations in Maternal Mid-Pregnancy Serum Samples: Association with Autism Spectrum Disorder and Intellectual Disability,” published in EHP on 23 August 2016, has been selected by the Children’s Environmental Health Network (CEHN) as its October 2016 Article of the Month. CEHN Article of the Month summaries discuss the potential policy implications of current children’s environmental health research. The CEHN summary can be viewed here.
This month Editor-in-Chief Sally Perreault Darney and International Program Manager Hui Hu are taking EHP to China. Their first stop is Wuhan for a workshop on recent perspectives on environmental health, organized by faculty of the Huazhong University of Science and Technology. Sally will speak about EHP’s scope and objectives as well as emerging issues in environmental health, while Hui will provide updates on the EHP Chinese Edition, including accessibility of social networking in China. (more…)
Featured Children’s Health
Veronica A. Tinney, Jerad M. Denton, Lucy Sciallo-Tyler, and Jerome A. Paulson
Jerome A. Paulson and Claire L. Barnett
Kim G. Harley, Katherine Kogut, Daniel S. Madrigal, Maritza Cardenas, Irene A. Vera, Gonzalo Meza-Alfaro, Jianwen She, Qi Gavin, Rana Zahedi, Asa Bradman, Brenda Eskenazi, and Kimberly L. Parra
Rebecca Massa Nachman, Guangyun Mao, Xingyou Zhang, Xiumei Hong, Zhu Chen, Claire Sampankanpanich Soria, Huan He, Guoying Wang, Deanna Caruso, Colleen Pearson, Shyam Biswal, Barry Zuckerman, Marsha Wills-Karp, and Xiaobin Wang