| In this paper, the whole year monitoring data from September2012to August2013were used to analyze the characterizations of PM (PM2.5and PM10) in Handan ofHebei. The results showed that the orders of PM2.5from the large to small werewinter>autumn>summer>spring. But for PM10, the orders were winter>autumn>spring>summer, the concentration in spring was higher than in summer that was dueto the occurrences of dust in the windy days. The southern areas of Hebei presentedzonal distribution of PM pollution in autumn and winter stimulated by MM5-CMAQ.The air pollution characteristics of Handan city during the time of December1,2012to January31,2013was analyzed using the online monitoring data of PM10, PM2.5,SO2and NOX, visibility and relative humidity observed at an air quality monitoringsite in the Hebei University of Engineering, especially on the severe haze episodehappened in January2013. The result showed that SO2, NOX, PM10and PM2.5werehigher than the secondary standard. The analysis of the severe haze episode showedthat the hourly average concentrations didn’t present the normal temporal variations inthe a few days near the pollution peak.The episode was analyzed to discuss the characteristics of these compositions inPM2.5used different periods. In1-13January (217.7μg m-3), the samplingconcentration of PM2.5was higher than in14-31January (139.5μg m-3). The sumconcentration of sulfate, nitrate and ammonium in1-13January accounted for23.3%of PM2.5, which was obviously lower than58.6%of14-31January. In1-13January,the daily concentrations of OC and EC were38.6μg m-3and20.1μg m-3. And theconcentrations of OC and EC were26.1μg m-3and11.6μg m-3in14-31January. Itwas found that higher concentrations of OC and EC occurred at the previous of theepisode. This phenomenon is opposite of water-soluble ions.PMF was applied to understand major sources to the severe haze pollution overthis city. The stimulated concentration of PM2.5was149.0μg m-3, which was lowerthan160.1μg m-3of the sampling concentration. Eight-factor were identified by PMFmodel. The major sources were coal combustion source (25.9%), secondary source(21.8%), industry source (16.2%), Ba, Mn and Zn source (12.7%), motor vehiclesource (7.7%), road dust source (6.9%), K+, As and V source (6.3%) and fuel oil combustion source (2.5%). The mean value of extinction coefficient (Bext) was682.1Mm-1and the largest contributor to Bextwas ammonium sulfate with the mean valueof221.0Mm-1, followed by the24.9%of EC,22.8%of ammonium nitrate and21.6%of OC.MM5-CMAQ model was applied to evaluate the source contributions to thesecondary inorganic ions from specific sectors. This study found that agriculturalsources (AG) contributed more secondary inorganic ions in Shijiazhuang, thecontributions to SO42-, NO3-and NH4+were more than10μg m-3. However, in Handanand Xingtai, the contributions to SO42-, NO3-and NH4+of AG were near to5μg m-3.In Handan, industrial sources (IN) contributed the highest concentration of SO42-,followed by domestic sources (DO), AG, transportation sources (TR) and power plantssources (PO). |
PDF Full Text Request