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Long-term exposure to PM2.5 and Children's lung function: a dose-based association analysis.

Sai Li1, Suzhen Cao1, Xiaoli Duan1

  • 1School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, China.

Journal of Thoracic Disease
|November 19, 2020
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Summary

Long-term exposure to fine particulate matter (PM2.5) significantly reduces children's lung function, specifically forced vital capacity (FVC) and forced expiratory volume in 1 second (FEV1). This study highlights the importance of accurate exposure dose assessment for understanding air pollution's health impacts on children.

Keywords:
Childrenaverage daily dose (ADD)fine particulate matter (fine PM)lung function

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Area of Science:

  • Environmental Health
  • Pediatric Pulmonology
  • Epidemiology

Background:

  • Inconsistent literature exists on the effects of long-term PM2.5 exposure on children's lung function, often due to inaccurate exposure assessments.
  • This study addresses these limitations by investigating the association between PM2.5 average daily dose (ADD) and lung function in school-aged children.

Purpose of the Study:

  • To investigate the association between long-term exposure to PM2.5, estimated as average daily dose (ADD), and lung function in school-age children.
  • To improve dose-response assessments by utilizing individual-level exposure dose estimates.

Main Methods:

  • Recruited 684 children aged 7-12 years in Lanzhou, China, for spirometric lung function tests and questionnaire surveys.
  • Estimated individual annual and 5-year average PM2.5 ADD using spatial distribution data and personal time-activity information.
  • Employed multiple linear regression models to analyze associations between ADD and lung function, controlling for covariates.

Main Results:

  • A 1 μg/kg-d increase in PM2.5 ADD was linked to a decrease in forced vital capacity (FVC) by 10.49 mL and forced expiratory volume in 1 second (FEV1) by 7.68 mL.
  • The most recent year of exposure showed the greatest impact on lung function, with a more pronounced effect observed in girls.
  • No significant associations were found between PM2.5 concentration and lung function, underscoring the importance of dose estimation.

Conclusions:

  • Long-term PM2.5 exposure, estimated as an average daily dose over a year or more, is significantly associated with reduced lung function (FVC and FEV1) in school-aged children.
  • Individual-level dose estimates are crucial for accurate dose-response assessments in air pollution studies.
  • Findings emphasize the need for effective air quality management strategies to protect children's respiratory health.