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| Relationship between air pollutants and respiratory diseases in children |
| HU Xiaoguang1，JIN Yi2，JIN Jiangbing1，LIN Li1，ZHANG Hailin1，LI Changchong1 |
| 1. The Second Affiliated Hospital & Yuying Children’s Hospital of Wenzhou Medical University，Wenzhou 325027，China；2. Aodi Community Health Service Center of Lucheng District，Wenzhou 325019，China |
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Abstract Objective To investigate the levels of different air pollutants in Wenzhou city in winter-spring season，and determine their relationship with airway diseases in childhood. Methods During January and April，2013，the live air quality data from Wenzhou city were obtained，and the data from visits to the pediatric outpatient and emergency department in the Second Affiliated Hospital & Yuying Children’s Hospital of Wenzhou Medical University were also collected. The correlation analysis was performed to investigate the relationship between air pollutant levels and respiratory diseases. Results During the study period，the average concentrations of PM2.5，PM10 and NO2 stayed in high level，and the level of CO was lower. The levels of air pollutants were lowest in February. Correlation analysis indicated that NO2 had the closest relationship with airway infection. Regression analysis revealed that 10 μg/m3 increase of NO2 might result in 3.5% increase of total outpatient visit quantity，4% increase of upper airway infection and 8% lower airway infection. PM2.5 closely related to acute exacerbation of asthma. An increase of 10 μg/m3 of PM2.5 might result in 10% increase of clinic visits due to acute asthma attack. Conclusion PM2.5 is a major pollutant in Wenzhou city in winter-spring season，and the concentration of PM10 and NO2 are also much higher than acceptable level. The change of PM2.5 has the closest relationship with acute asthma attack，and NO2 might be the most important risk factor for airway infection.
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