ABSTRACT
Objective To understand the effects of ambient air pollution on respiratory disease and symptoms among school-age children in Beijing and provide scientific basis for control and prevention of ambient air pollution in order to enhance the chidren's health. Methods The investigation was carried out in 3 areas(A, B, C) with ambient air pollution in different degrees of by different air pollution source in Beijing based on the data of environmental monitoring. 3 primary schools were selected in each investigation area. There were 5 749 observed pupils from 3 area in total. Investigation on respiratory health was performed by using the standard questionaire among pupils of Grade 1-Grade 5 in each school sampled by claster sampling method. Results The prevalences of respiratory disease and symptoms among children in A area with better ambient air quality were significantly lower than those in B area and C area with heavy ambient air pollution(P