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Air pollution and diseases of the respiratory tracts in pre-school children: A transfer function model

U Helfenstein1, U Ackermann-Liebrich, C Braun-Fahrländer

  • 1Biostatistisches Zentrum, medizinische Fakultät, Universität Zürich, Plattenstrasse 54, CH-8032, Zurich, Switzerland.

Environmental Monitoring and Assessment
|November 16, 2013
PubMed

Insights

This study analyzed air pollution and weather data against respiratory illness in preschool children. Sulfur dioxide (SO2) showed an immediate link to respiratory symptoms during winter, but not other seasons.

Area of Science:

  • Environmental Health
  • Pediatric Respiratory Medicine
  • Biostatistics

Background:

  • Respiratory diseases are a significant health concern in preschool children.
  • Environmental factors, including air pollutants and climate, are suspected contributors to respiratory illnesses.
  • Understanding these relationships is crucial for public health interventions.

Purpose of the Study:

  • To assess the statistical relationship between time series of environmental factors and respiratory disease frequencies in preschool children.
  • To analyze the connection between daily air pollutant and climatic variable measurements and respiratory health outcomes.
  • To investigate the temporal dynamics of these associations.

Main Methods:

  • Collected daily measurements of air pollutants (e.g., SO2, NO2) and climatic variables over one year.
  • Gathered medical data on preschool children's respiratory diseases (ENTRIES) and symptoms (SYMPTOMS).
  • Employed transfer function models and time series analysis, including prewhitening techniques, to analyze relationships.

Main Results:

  • Transfer function models revealed associations between environmental factors and respiratory outcomes.
  • The cross-correlation function between sulfur dioxide (SO2) and respiratory symptoms (SYMPTOMS) varied seasonally.
  • An instantaneous relationship between SO2 and SYMPTOMS was observed during winter, with a similar, though weaker, link for NO2.

Conclusions:

  • Environmental factors, particularly air pollutants like SO2, are linked to respiratory symptoms in preschool children.
  • The identified relationship between SO2 and respiratory symptoms is time-dependent, being significant only during the winter period.
  • These findings highlight the seasonal impact of air quality on pediatric respiratory health.

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