本文研究二组居住住大气污染水平不同的工业城市的儿童唾液IgA的水平。实验分A、B区:A区为工业粉尘、有毒气体严重污染大气的地区;B区(对照组)为大气污染指数较低的地区。 IgA的测定采用放射免疫扩散法,自早晨儿童进食后3小时的同一时间取口腔唾液,并于取样后2小时内检查。共检查A区298名7～8岁的一年级学生,其中147名儿童还分别测定了秋、冬和春季的IgA水平;B区共检查了 In this paper, the level of IgA in children’s saliva in two industrialized cities with different levels of living air pollution was studied. Experimental points A, B: A zone for industrial dust, toxic gas serious air pollution area; B (control group) for the area with low air pollution index. IgA was measured by radioimmunoassay and oral saliva was taken at 3 hours after the morning meal in children and examined within 2 hours after sampling. A total of 298 freshmen, aged 7-8 years, were examined in Area A, of which 147 children were also tested for IgA levels in autumn, winter and spring. Area B was examined