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A GIS-based assessment of environmental influences on allergy development in children

Agnes Lam1, Gary W K Wong1, Chin Man Poon1

  • 1The Chinese University of Hong Kong, Shatin, Hong Kong SAR.

Asia-Pacific Journal of Public Health
|December 22, 2011
PubMed

Insights

Indoor mold and maternal smoking increase allergy risks in children. Outdoor air pollution showed no significant link to asthma or rhinoconjunctivitis in this preschool study.

Area of Science:

  • Pediatric Allergy and Environmental Health
  • Epidemiology of Allergic Diseases
  • Childhood Respiratory Health

Background:

  • Allergies like asthma and rhinoconjunctivitis are significant public health concerns in children.
  • Understanding environmental triggers is crucial for developing effective prevention strategies.
  • Previous research suggests both indoor and outdoor factors may influence allergy development.

Purpose of the Study:

  • To investigate the association between indoor/outdoor environmental factors and the development of asthma and rhinoconjunctivitis in preschool children.
  • To determine the prevalence and incidence of these allergic conditions in a specific Hong Kong district.
  • To differentiate the impact of indoor versus outdoor environmental exposures.

Main Methods:

  • A questionnaire-based survey was conducted with 508 preschool children (aged 4-6) in Hong Kong.
  • Data collection followed the International Study of Asthma and Allergies in Childhood (ISAAC) protocol.
  • Parent-reported indoor environmental factors (moisture, mold) and outdoor factors (traffic pollution), along with maternal smoking, were assessed.

Main Results:

  • Exposure to indoor moisture and mold in the first year of life significantly increased the risk of developing asthma (aOR=2.56) and rhinoconjunctivitis (aOR=2.09).
  • Current maternal smoking was associated with a higher prevalence of childhood asthma (aOR=2.00).
  • No significant association was found between outdoor traffic-related air pollutants and the prevalence of these allergic conditions.

Conclusions:

  • Indoor environmental factors, particularly moisture and mold, play a significant role in childhood allergy development.
  • Maternal smoking is a notable risk factor for childhood asthma.
  • The impact of outdoor traffic-related air pollution on allergy development in this cohort was less clear and requires further investigation.

Keywords:
asthmaindoor environmentmaternal smokingmoisture and moldoutdoor environmentpreschool childrenrhinoconjunctivitisrisk factors

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