Long-term exposure to background air pollution related to respiratory and allergic health in schoolchildren

Clin Exp Allergy. 2005 Oct;35(10):1279-87. doi: 10.1111/j.1365-2222.2005.02336.x.


Background: The impact of air pollution on asthma and allergies still remains a debate.

Objective: Our cross-sectional study was intended to analyse the associations between long-term exposure to background air pollution and atopic and respiratory outcomes in a large population-based sample of schoolchildren.

Methods: Six thousand six hundred and seventy-two children aged 9-11 years recruited from 108 randomly schools in six French cities underwent a clinical examination including a skin prick test (SPT) to common allergens, exercise-induced bronchial reactivity (EIB) and skin examination for flexural dermatitis. The prevalence of asthma, allergic rhinitis (AR) and atopic dermatitis was assessed by a standardized health questionnaire completed by the parents. Three-year-averaged concentrations of air pollutants (NO2, SO2, PM10 and O3) were calculated at children' schools using measurements of background monitoring stations.

Results: After adjusting for confounders, EIB, lifetime asthma and lifetime AR were found to be positively related to an increase in the exposure to SO2, PM10 and O3. The adjusted odds ratios (aOR) per increase of 5 microg/m3 of SO2 was 1.39 (95% confidence interval (CI)=1.15-1.66) for EIB and 1.19 (1.00-1.41) for lifetime asthma. The aOR for lifetime AR per increase of 10 microg/m3 of PM10 was 1.32 (CI=1.04-1.68). Moreover, SPT positivity was associated with O3 (aOR=1.34; CI=1.24-1.46). Associations with past year symptoms were consistent, even if not always statistically significant. Results persisted in long-term resident (current address for at least 8 years) children. However, no consistent positive association was found with NO2.

Conclusions: A moderate increase in long-term exposure to background ambient air pollution was associated with an increased prevalence of respiratory and atopic indicators in children.

Publication types

  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Air Pollutants / adverse effects*
  • Air Pollutants / analysis
  • Air Pollution / adverse effects
  • Asthma / epidemiology
  • Asthma / etiology
  • Bronchial Hyperreactivity / epidemiology
  • Bronchial Hyperreactivity / etiology
  • Child
  • Cross-Sectional Studies
  • Dermatitis, Atopic / epidemiology
  • Dermatitis, Atopic / etiology
  • Environmental Monitoring / methods
  • Epidemiological Monitoring
  • Female
  • France / epidemiology
  • Humans
  • Hypersensitivity, Immediate / etiology*
  • Male
  • Nitrogen Dioxide / adverse effects
  • Nitrogen Dioxide / analysis
  • Ozone / adverse effects
  • Ozone / analysis
  • Prevalence
  • Rhinitis / epidemiology
  • Rhinitis / etiology
  • Schools
  • Skin Tests / methods
  • Sulfur Dioxide / adverse effects
  • Sulfur Dioxide / analysis
  • Vehicle Emissions / adverse effects
  • Vehicle Emissions / analysis


  • Air Pollutants
  • Vehicle Emissions
  • Sulfur Dioxide
  • Ozone
  • Nitrogen Dioxide