Characteristics and relationship of PM, PM_(10), PM2.5 concentration in a polluted city in northern China

摘要

Ground measurements of particulate matter (PM), PM_(10) and PM_(2.5) were recorded using a ten-channel Quartz Crystal Microbalance (QCM) Cascade Impactor in a polluted city, Shijiazhuang, northern China for the period Jan.-Mar. and Jun. 2007. The spectra characteristics in the concentrations of PM are analyzed. PM, PM_(2.5) and PM_(10) monthly variations are researched. PM mass concentration is similar with Beijing and four times higher than some clean sites. Mass and number concentration relationships between PM_(2.5) and PM_(10) are analyzed and calculated. The mass concentration ratio of PM_(2.5) to PM_(10) is 0.7. The ratio of the number concentration to mass concentration of PM_(2.5) is 76,419. These relationships are used to calculate PM_(2.5) number concentration by PM_(10)mass concentration for daily publication observation. Then the diurnal variation of PM_(2.5) number concentration is analyzed from Jan.-Mar. 2007. This attempt provides a new way to analysis fine particles feature by using regular daily observations of PM_(10).