室内相对湿度对不同粒径颗粒物浓度的影响

The Analysis of Influence of Indoor Relative Humidity on Indoor Particulate Matters

为探究学校室内颗粒物的浓度分布及相对湿度对其的影响,该文对220间中小学教室室内不同粒径的颗粒物计数浓度及相对湿度进行了2年的测量。分析了颗粒物在多个湿度区间的浓度分布以及不同粒径的颗粒物在湿度区间内的相关性。结果表明,室内较细微的颗粒物占比最高;较细微颗粒物与较粗大颗粒物的浓度分布与相对湿度的相关性呈现2种不同模式;室内0.3~1.0μm范围内的颗粒物计数浓度最高,占整个测量范围(0.3~25μm)的90%。PN0.3、PN0.5在相对湿度范围为80%~90%内的颗粒物计数浓度最高,PN1在相对湿度范围为40%~50%和相对湿度范围为70%~80%的颗粒物计数浓度最高。PN2.5、PN5、PN10在相对湿度区间为40%~50%的颗粒物计数浓度最高。PN0.3与PN0.5,PN1与PN2.5,PN5与PN10之间存在显著的相关性,P<0.01,其相关性强度与在不同湿度区间的分布规律一致。

In order to explore the concentration distribution of particulate matter in elementary classrooms and the influence of relative humidity towards the indoor particles,the research team monitored the classroom relative humidity levels and the concentration of particulate matter of different sizes in 220 elementary and secondary classrooms in the Midwestern United States for two consecutive years.The concentration distribution of particulate matter in various humidity ranges and the correlations of particulate matter of different sizes with relative humidity were analyzed.The research results shown that indoor relatively small particles had the highest proportion of total monitored indoor particles,the correlations between the fine particles and coarse particles with relative humidity presented two different patterns,and the indoor concentration of fine particles and coarse particles has a significant correlation which the correlation coefficient varied in different relative humidity range.