作　　者： ; ; ; ; ; ;

机构地区： 中国科学院广州地球化学研究所

出　　处： 《地球与环境》 2005年第2期57-60,共4页

摘　　要： 采用直读式DustTrak8520型颗粒物浓度测定仪在2003年7月至2004年6月期间对广州市街道PM10、PM2.5进行了初步测定,结果表明PM10、PM2.5质量浓度季节变化幅度较大,并且它们的变化趋势相似。与国内很多城市不同,PM10、PM2.5质量浓度日变化都呈上午低、下午高、夜间21点左右出现峰值的特征。PM10、PM2.5两者之间存在显著的相关性,相关系数r=0.98。PM2.5/PM10平均值为0.85,表明广州市街道空气中细颗子(PM2.5)在可吸入颗粒物中占很大比重。 With a portable direct-reading Model 8520 DustTrak analyzer, street-level PM_(10) and PM_(2.5) mass concentrations were measured in urban Guangzhou from July 2003 to June 2004. In the study period PM_(10) and PM_(2.5) both exhibited a wide seasonal variation and similar seasonal trends. Unlike those in other cities in China, PM_(10) and PM_(2.5) in Guangzhou had a diurnal pattern with lower concentrations in the morning, higher values in the afternoon and peak values at about 21:00 in the evening. PM_(10) and PM_(2.5) were well correlated (r=0.98), and the ratio of PM_(2.5) to PM_(10) averaged 0.85, indicating that the fine particles (PM_(2.5)) shared a much larger fraction in respirable suspended particulates on Guangzhou streets.

关 键 词： 可吸入颗粒物 细粒子 空气污染 城区环境

领　　域： [环境科学与工程]