Abstract: Objective To explore the indoor air pollution level and its related factors.Methods Carbon dioxide(CO₂),carbon monoxide(CO),nitrogen dioxide(NO₂),benzene,toluene,formaldehyde,and PM10 were measured in bed-rooms and classrooms of 100 children in summer-autumn and winter-spring seasons.Results In the bedrooms,the NO₂ level was higher in winter-spring(70.15 μg/m³) and the formaldehyde level was higher in summer-autumn(61.18 μg/m³).In the classrooms,the level of CO,CO,and NO₂ were higher in winter-spring and the formaldehyde level was higher in summer-autumn.Gas cooking,indoor smoking and residence near traffic way were predictors for high level of CO,CO₂,NO₂ and new furniture,new house,indoor smoking were predictors for exposure of formaldehyde,benzene,and toluene.Conclusion Based on the results scientific methods should be used to controll the indoor air pollution.