中文摘要：

为了把握雾霾天气大气环境细颗粒物PM2.5浓度变化对室内环境的影响规律,项目组先后于2013年6月~8月（夏季）和2013年12月~2014年2月（冬季）对北京地区一办公建筑室内外细颗粒物（PM2.5）质量浓度及I/O比值变化规律进行了实时监测。实测结果表明：1）在建筑外窗关闭、室内无其他污染源且机械通风系统关闭条件下,夏、冬季室内外PM2.5质量浓度的日变化规律均为夜间高白天低,周变化规律为周一~周五呈逐渐上升趋势;2）冬季各月的室内外PM2.5质量浓度水平均高于夏季各月的,对应的室内外PM2.5质量浓度I/O比值也是冬季高于夏季;3）室外风速和空气相对湿度与室内外PM2.5质量浓度存在明显的负相关,而室外空气温度与室内外PM2.5质量浓度水平的变化相关性不明显。

英文摘要：

To find out how the change of PM2.5 mass concentration in hazy weather influences indoor environment, our project team conducted real-time monitoring and investigation with respect to the varying pattern of mass concentration and I/O ratio of fine particles （PM2.5 ） indoors and outdoors in an office building in Beijing from June 2013 to August 2013 （summer） and from December 2013 to February 2014 （winter） , respectively. The results of field survey indicated that： 1 ） the mass concentration of PM2.5 indoors and outdoors in summer and winter was high at night and low in the daytime and increased from Monday to Friday on the condition that the external windows of buildings were closed, no other pollution sources existed indoors and mechanical ventilation system was closed; 2） the monthly mass concentration of PM2.5 indoors and outdoors in winter was higher than that in summer, and the I/O ratio of mass concentration of PM2.5 indoors and outdoors in winter was also higher than that in summer; 3） the wind speed outdoors and relative air humidity had a strong negative correlation with varying pattern of mass concentration of PM2.5 indoors and outdoors, while the air temperature outdoors was not significantly correlated with the change of mass concentration of PM2.5 indoors and outdoors.