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Ambient nitrogen oxides exposure and early childhood respiratory illnesses
Rakesh Ghosh1, Jesse Joad, Ivan Benes
1Department of Public Health Sciences, University of California, Davis, Davis, CA 95616, USA.
Insights
Exposure to nitrogen oxides (NOx) is linked to increased rates of bronchitis in young children. This study highlights a significant association between air pollution and respiratory infections in children under 5.
Area of Science:
- Environmental Health
- Pediatric Respiratory Medicine
- Epidemiology
Background:
- Acute respiratory infections are a leading cause of illness in children under five.
- Emerging evidence suggests a connection between air pollution and pediatric respiratory conditions.
- Nitrogen oxides (NOx) are common air pollutants with potential health impacts.
Purpose of the Study:
- To investigate the association between ambient nitrogen oxides (NOx) exposure and the incidence of bronchitis or upper airway inflammation in children.
- To analyze this association across different age groups within the first 4.5 years of life.
- To contribute to understanding the public health implications of air pollution on early childhood respiratory health.
Main Methods:
- A longitudinal study design was employed in the Teplice and Prachatice districts, Czech Republic.
- Children were monitored from birth to 4.5 years, with data collected from medical records and questionnaires.
- Logistic regression analysis using generalized estimating equations quantified the association between NOx exposure (various averaging periods) and respiratory outcomes.
Main Results:
- A significant association was found between a 30-day average increase in NOx and bronchitis in children under 2 years (Rate Ratio: 1.31) and 2-4.5 years (Rate Ratio: 1.23).
- A 14-day NOx exposure also showed a stable association across both age groups (RR: 1.25 and 1.21, respectively).
- The association between bronchitis and NOx exposure demonstrated an increasing trend with age in children under 2 years.
Conclusions:
- Ambient nitrogen oxides (NOx) are significantly associated with respiratory infections severe enough to require medical attention in young children.
- The findings suggest a potential public health concern regarding the impact of NOx on preschool children's respiratory health.
- The observed age-dependent association in younger children warrants further investigation into specific exposure windows and mechanisms.
Abstract:
Acute respiratory infections are common in children below 5 years and recent studies suggest a possible link with air pollution. In this study, we investigated the association between ambient nitrogen oxides (NO(x)) and bronchitis or upper airway inflammation. This longitudinal study was conducted in Teplice and Prachatice districts, Czech Republic. Children were followed from birth to 4.5 years of age. Data were compiled from medical records at delivery and at follow up, and from self-administered questionnaires from the same two time points. Air pollution monitoring data were used to estimate exposure over five different averaging periods ranging from three to 45 days prior to an episode. To quantify the association between exposure and outcome, while accounting for repeated measure correlation we conducted logistic regression analysis using generalized estimating equations. During the first 2 years of life, the adjusted rate ratio for bronchitis associated with interquartile increase in the 30-day average NO(x) was 1.31 [95% confidence interval (CI): 1.07, 1.61] and for two to 4.5 year olds, it was 1.23 (95% CI: 1.01, 1.49). The 14-day exposure also had stable association across both age groups: below 2 years it was 1.25 (95% CI: 1.06, 1.47) and for two to 4.5 years it was 1.21 (95% CI: 1.06, 1.39). The association between bronchitis and NO(x) increased with child's age in the under 2 years group, which is a relatively novel finding. The results demonstrate an association between NO(x) and respiratory infections that are sufficiently severe to come to medical attention. The evidence, if causal, can be of public health concern because acute respiratory illnesses are common in preschool children.
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