The Analysis of the Impact of Air Pollution of Four Cities in China on Children's Respiratory Health

In four years, 7900 children aged 7～12 of 8 primary schools in the 4 Chinese cites were investigated including indoor circumstance, family health status. Also, outdoor air pollution was monitored for 2 years in the schools. Through the data of PM 2.5 , PM 10 ,TSP,SO 2 and NO x, it showed that air pollution in the 2 schools in Lanzhou was the heaviest, urban sites in the Guangzhou, Wuhan and Chongqing were moderate, suburban sites in the 3 cities were relatively slight. All of the 8 schools did not meet the second air quality standards of China. Prevalence of children's respiratory illness (cough when cold, phlegm, wheeze, asthma and bronchitis)has positive relation with air pollution significantly and has been negatively affected from slight to heavy degree. Among the polluted factors, PM 2.5 and PM 10 have the greatest impact, while SO 2, NO x have relatively sight impact. Indoor air pollution includes the usage of coal for heating and cooking, passive smoking by adults and indoor smoke degree, which havs positive relation with children's prevalence of respiratory illness. Indoor air pollution has also negative effect.