公共场所室内PM_(2.5)质量浓度测定分析

Determination and analysis of mass concentration of PM_(2.5) in public areas

以高校大型学生餐厅为例,通过对餐厅室内和室外PM_(2.5)浓度的测量及分析发现,1)室内、外PM_(2.5)质量浓度有着较大的差别,测量时间段内,室外PM_(2.5)的质量浓度均小于50μg/m^3,而室内PM_(2.5)浓度波动变化,变化范围为45μg/m^3~210μg/m^3。2)室外空气中湿度因素对空气中PM_(2.5)浓度影响显著;3)早、中、晚3个时间段测量,午间就餐高峰时,PM_(2.5)浓度最大。

By measuring the concentration of PM2.5 in a student restaurant and in the corresponding outdoor,it is found that there is a great difference in mass concentration of PM2.5 in the room and outside of the student restaurant.The mass concentration of outdoor PM2.5 is less than 50μg/m^3.The indoor PM2.5 concentration show a trend of fluctuation from 45μg/m^3 to 210μg/m^3.Humidity factors in outdoor air have a significant influence on the concentration of PM2.5 in the air.At the three time period of early,middle and late evening,the concentration of PM2.5 was the largest at the peak of lunch in the middle of the afternoon.