[目的 ]观察开窗时间对室内空气中苯和甲苯浓度的影响。 [方法 ]苯和甲苯浓度的测定方法按照GB1173 7 89。选 16间新装修房间 ,竣工后第 2天开始观察 ,随机分为 4组 ,每 4间房间为一组 ,各组每天的开窗时间分别的 0、2、4、6h。隔日测定苯和甲苯的浓度 ,共 9d。 [结果 ]①苯 :2、4h组与 0h组 (对照组 )比较差异无显著性 :6h组与对照组比较差异有显著性 (P <0 .0 5 )。与本组第 1天的浓度比较 ,0、2、4、6h组分别在第 7、5、7、3天以后差异有显著性 (P <0 .0 5 )。②甲苯 :2、4、6h组与对照组比较分别在第 9、3、7天以后差异有显著性 (P <0 .0 1、P <0 .0 5、P <0 .0 5 ) ;0、2、4、6h组与本组第 1天的浓度比较分别在第 5、3、3、3天以后差异有显著性 (P <0 .0 5 )。 [结论 ]开窗时间越长 ,苯和甲苯浓度降低越明显 [Objective] To observe the influence of window opening time on the concentration of benzene and toluene in indoor air. [Method] The determination method of benzene and toluene concentration was in accordance with GB1173 7 89. Select 16 newly renovated rooms, the first 2 days after the completion of the observation, were randomly divided into 4 groups, each of 4 rooms for a group, each group of window time 0,2,4,6 h, respectively. The concentrations of benzene and toluene were measured every other day for a total of 9 days. [Results] ① Benzene: No significant difference was found between 2,4h group and 0h group (control group). There was significant difference between 6h group and control group (P <0.05). Compared with the first day of this group, there was a significant difference in the 0, 2, 4 and 6h groups after the 7th, 5th, 7th and the 3rd days respectively (P <0.05). ② Toluene: There was a significant difference between the 2,4,6h group and the control group on the 9th, the 7th and the 7th days (P <0. 01, P <0. 05, P <0. 05) The concentrations of 0, 2, 4, 6h group and the first day of the group were significantly different after 5,3,3,3 days (P <0.05). [Conclusion] The longer the window opening time, the more obvious the decrease of benzene and toluene concentration