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Air pollution and bronchiolitis: a case-control study in Antwerp, Belgium
Daan Van Brusselen1,2,3, Katrien De Troeyer4, Marinus Pieter van Vliet5
1Department of Paediatric Infectiology, ZAS Hospitals, Antwerp, Belgium. daan.vanbrusselen@zas.be.
European Journal of Pediatrics
|March 12, 2024
Summary
This study suggests medium-term exposure to air pollutants like PM10 and NO2, especially in daycare settings, may increase the risk of severe bronchiolitis in young children. Further research is needed to confirm these findings on air pollution and infant respiratory illness.
Area of Science:
- Environmental Health
- Pediatric Respiratory Medicine
- Epidemiology
Background:
- Bronchiolitis is a major cause of infant hospitalization globally, with significant seasonal variations in admissions.
- Previous research on the link between air pollution and bronchiolitis has yielded inconsistent results, particularly from US-based studies.
Purpose of the Study:
- To investigate the association between short-term and medium-term exposure to specific air pollutants (PM2.5, PM10, BC, NO2) and the risk of severe bronchiolitis in children under two years old.
- To analyze air pollution exposure at home and daycare settings in relation to severe bronchiolitis risk.
Main Methods:
- A case-control study involving 118 cases of severe bronchiolitis and 79 controls admitted to hospitals in Antwerp, Belgium.
- Air pollutant exposure levels were estimated using an interpolation model, and unconditional logistic regression was employed to assess associations, controlling for confounders.
Main Results:
- While short-term air pollution showed no significant differences, medium-term exposure (31 days) to PM2.5, PM10, and NO2 was higher in cases during univariate analysis.
- Logistic regression indicated an association between severe bronchiolitis and increased PM2.5, PM10, and NO2 exposure, particularly in daycare settings after time adjustment.
- Specifically, medium-term exposure to PM10 and NO2 in daycare remained significantly associated with severe bronchiolitis (aOR 5.13 and 3.88, respectively).
Conclusions:
- A potential link exists between medium-term exposure to PM10 and NO2 air pollution, especially within daycare environments, and the risk of severe bronchiolitis in young children.
- The findings suggest that air quality in daycare centers may be a critical factor influencing infant respiratory health.
- Larger-scale studies are recommended to validate these associations and further elucidate the impact of air pollution on severe bronchiolitis.
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