Air Quality, Atmosphere & Health

, Volume 5, Issue 4, pp 369–381 | Cite as

Exposure to particulate matter and adverse birth outcomes: a comprehensive review and meta-analysis

  • Amir Sapkota
  • Adam P. Chelikowsky
  • Keeve E. Nachman
  • Aaron J. Cohen
  • Beate Ritz
Article

Abstract

Increasing number of studies have investigated the impact of maternal exposure to air pollution during pregnancy and adverse birth outcomes, particularly low birth weight (LBW, <2,500 g at birth) and preterm birth (PTB, <37 completed weeks of gestation). We performed a comprehensive review of the peer-reviewed literature and a meta-analysis to quantify the association between maternal exposure to particulate matter with aerodynamic diameter 2.5 and 10 μm (PM2.5 and PM10) during pregnancy and the risk of LBW and PTB. We identified 20 peer-reviewed articles providing quantitative estimate of exposure and outcome that met our selection criteria. There was significant heterogeneity between studies, particularly for findings related to PM10 exposure (LBW, I-squared 54%, p = 0.01; PTB, I-squared = 73%, p < 0.01). Results from random-effect meta-analysis suggested a 9% increase in risk of LBW associated with a 10-μg/m3 increase in PM2.5 (combined odds ratios (OR), 1.09; 95% confidence interval (CI), 0.90–1.32), but our 95% CI included the null value. We estimated a 15% increase in risk of PTB for each 10-μg/m3 increase in PM2.5 (combined OR, 1.15; CI, 1.14–1.16). The magnitude of risk associated with PM10 exposure was smaller (2% per 10-μg/m3 increase) and similar in size for both LBW and PTB, neither reaching formal statistical significance. We observed no significant publication bias, with p > 0.05 based on both Begg's and Egger's bias tests. Our results suggest that maternal exposure to PM, particularly PM2.5 may have adverse effect on birth outcomes. Additional mechanistic studies are needed to understand the underlying mechanisms for this association.

Keywords

Adverse birth outcome Low birth weight (LBW) Preterm birth (PTB) Air pollution Particulate matter Maternal exposure 

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Amir Sapkota
    • 1
  • Adam P. Chelikowsky
    • 1
  • Keeve E. Nachman
    • 2
  • Aaron J. Cohen
    • 3
  • Beate Ritz
    • 4
  1. 1.Maryland Institute for Applied Environmental HealthUniversity of Maryland College Park School of Public HealthCollege ParkUSA
  2. 2.Centre for Livable FutureJohns Hopkins Bloomberg School of Public HealthBaltimoreUSA
  3. 3.Health Effects InstituteBostonUSA
  4. 4.Department of EpidemiologyUCLA School of Public HealthLos AngelesUSA

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