对宁波地区北仑和奉化站、温州地区乐清站3个监测点夏季TSP、PM10、PM2.5和PM1.0进行监测,测试分析各种粒径颗粒物浓度水平和粒径分布特征,并通过化学质量平衡(CMB)受体模型对颗粒物进行源解析.监测结果显示,夏季宁波、温州地区TSP和PM10日均浓度为0.049～0.134mg/m3和0.025～0.084mg/m3,均未超过我国环境空气质量二级标准；PM2.5日均浓度为0.007～0.069mg/m3,按美国2006年EPA最新标准限值0.035mg/m3衡量,奉化、乐清、北仑站的超标天数占总监测天数的比例分别为75％、40％和37.5％.粒径分布统计结果显示,3个监测站点PM10占TSP的比例为48.78％～86.96％；PM2.5占TSP的比例为33.33％～72.46％；奉化和乐清监测点PM10中PM2.5和PM1.0的比例平均值在50％以上.源解析结果显示,夏季TSP主要来源于土壤尘,其次是建筑尘和煤烟尘,其贡献率分别为40.70％～55.49％、9.62％～13.64％和5.85％～17.28％.%TSP, PM1(}, PM2.5 and PM1.0 were monitored at Beilun, Fenghua and Yueqing monitoring stations during summertime in order to find out the concentration and particle size distribution and the Chemical Mass Balance ( CMB) Model was used for source identification and apportionment of TSP. The monitoring results indicated that the daily average concentration of TSP and PM10 were 0. 049 ~ 0. 134mg/m3 and 0.025 ~ 0.084 mg/m3 which didn' t exceed the Grade II national standards for air quality and the PM2, concentration was 0. 007 - 0. 069mg/m There are 75% 40% and 37. 5% of the monitoring days that the PM2. 3 concentrations exceeded the latest standard value (0.035 mg/m3) of USEPA in 2006 respectively in Fenghua, Yueqing, Beilun station. The statistic result of the particle size distribution has shown that PM,0/TSP and PM2 3/TSP were 48. 78% ~ 86. 96% and 33. 33% ~ 72.46% and at Fenghua and Yueqing station PM2.5/PM,0 and PM,1. 0/PM10 were more than 50%. Ambient and source data were used in the CMB model for source identification and apportionment, indicating that major sources of TSP in Ningbo and Wenzhou City were soil dust(40. 70% -55.49% ), building dusts(9. 62% - 13. 64% ) and coal combustion (5. 85% - 17. 28% ).
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