RESUMO
Objective@#To investigate the effects of ambient air pollution on the school age children s diseases, symptoms and school absence, and to provide a reference for preventing the harmful effect of air pollution on students.@*Methods@#Health questionnaires surveys were conducted among 792 students of the fourth grade in a primary school in Hangzhou, and the incidence of diseases and symptoms were continuously monitored every day during the winter of 2014-2017. The generalized additive model based on Poisson regression was used to analyze the health effects caused by single pollution. The multivariate Logistic regression model was used to analyze the comprehensive effects of family, living environment and air pollution on student health.@*Results@#Totally 415 students(52.4%) had a history of diseases and 265 students(33.5%) had a history of allergy. During the investigation, the average concentrations of PM 2.5 , PM 10 , SO 2 and NO 2 were (81.0±2.8) (122.2±3.9) (17.9±0.6) and (68.9±1.4)μg/m 3. Strongest associations were found for lag 3 day of exposure among PM 2.5 , PM 10 and NO 2 on illness and absence. Increases of 10 μg/m 3 in PM 2.5 , PM 10 and NO 2 were associated with 1.02(95% CI =1.01-1.02), 1.04(95% CI =1.03-1.06) and 1.03(95% CI =1.02- 1.04 ) increases in daily illness rates. SO 2 lag for 5 days had the most significant effect on students health. Father s education was the protective factor for illness ( OR =0.83) and symptoms( OR =0.84 ). The risk factors for symptoms included furniture replacement within one year( OR =1.78), pet feeding( OR =1.94), respiratory infections within one year( OR =1.82), allergies rhinitis( OR =2.24), family history with coronary heart disease/hypertension( OR =1.46), indoor activity time ( OR =1.02) and atmospheric PM 10 concentration( OR =1.09)( P <0.05).@*Conclusion@#The increase of air pollution concentration has an impact on the illness, symptoms and absence from school, and there is a lag effect. Father s education is a protective factor for the health of students. Indoor pollution and outdoor air pollution can lead to the occurrence of illness and symptoms.