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Nitrogen dioxide exposure assessment and cough among preschool children
1Department of Environmental Medicine, National Public Health Institute, Kuopio, Finland.
Insights
High personal exposure to nitrogen dioxide (NO2) significantly increased cough risk in children during winter. Accurate exposure assessment is crucial for understanding air pollution
Area of Science:
- Environmental Health
- Pediatric Respiratory Health
- Air Quality Monitoring
Background:
- Ambient air pollution, specifically nitrogen dioxide (NO2), is a growing concern for public health.
- Children are particularly vulnerable to the respiratory effects of air pollutants due to their developing lungs.
Purpose of the Study:
- To investigate the association between ambient air nitrogen dioxide exposure and the occurrence of cough in young children.
- To compare different methods of assessing nitrogen dioxide exposure in relation to health outcomes.
Main Methods:
- A panel study involving 162 children aged 3-6 years.
- Weekly average nitrogen dioxide exposure measured personally, outside, and inside day-care centers using Palmes tubes.
- Daily recording of cough episodes by parents via diaries.
- Comparison with ambient air NO2 concentrations from a local air quality monitoring network.
Main Results:
- A significant increase in cough risk (relative risk = 3.63) was observed in the highest personal nitrogen dioxide exposure category during winter.
- A positive, though nonsignificant, trend in cough risk was noted for other personal and day-care center exposure assessment methods in winter.
- In spring, nonsignificant increases in cough risk were observed across most exposure assessment groups, with the exception of fixed-site monitoring.
Conclusions:
- Personal nitrogen dioxide exposure is significantly associated with an increased risk of cough in young children, particularly during winter.
- The choice of exposure assessment method is critical for accurately reflecting the pollutant dose and its health impact.
- Further research should focus on refining exposure assessment techniques to better understand the relationship between air pollution and pediatric respiratory symptoms.
Abstract:
The association between exposure to ambient air nitrogen dioxide and cough was evaluated in a panel study among 162 children aged 3-6 y. The weekly average nitrogen dioxide exposure was assessed with Palmes-tube measurements in three ways: (1) personally, (2) outside day-care centers, and (3) inside day-care centers. Ambient air nitrogen dioxide concentrations were obtained from the local network that monitored air quality. The parents recorded cough episodes daily in a diary. The risk of cough increased significantly (relative risk = 3.63; 95% confidence interval = 1.41, 9.30) in the highest personal nitrogen dioxide exposure category in winter, and a nonsignificant positive trend was noted for the other assessment groups. In spring, risk increased nonsignificantly in all exposure-assessment groups, except for the fixed-site monitoring assessment. It is important that investigators select an exposure-assessment method sufficiently accurate to reflect the effective pollutant dose in subjects.