城市环境空气中 PM10和 PM2．5质量浓度分布的均匀性研究

摘要

The concentration of PM10 and PM2.5 in Changsha City ambient air was monitored automatically, and their uniformity distribution was also analyzed.The results indicated that the distribution of PM2.5 concentra-tion was more uniform than that of PM10 in four typical moments of a day and within a day.However,from the per-spectives of daily average concentration in a month and monthly average of first 10 months in 2013,the variation coefficient of PM2.5 concentration was higher than that of PM10 as a whole.Therefore,the distribution of PM2.5 con-centration was more nonuniform than that of PM10 on long time scale.With regard to the concentration distribution in different functional area,there was no significant difference between PM10 and PM2.5 .Thus,there was no neces-sary connection between the range of change and the types of functional area.%对长沙市环境空气中 PM10、PM2．5质量浓度进行自动监测，并统计分析其分布的均匀性。结果表明，在1 d 的4个典型时刻以及日内，PM2．5的质量浓度分布总体上较 PM10均匀；从月内日均值及2013年1月—10月的月均值变化情况看，PM2．5质量浓度的相对标准偏差（RSD）总体高于 PM10，表明 PM2．5在长时间尺度上的分布较 PM10更不均匀；就功能区分布而言，PM10、PM2．5质量浓度分布的均匀性没有明显的区域差异，两者的变化幅度与功能区类别没有必然联系。