中文摘要：

北京－天津－河北地区工业城市保定大气颗粒物（Particulate matter，PM）污染严重，保定大气颗粒物尤其是细粒子和超细粒子污染严重，其中含碳组分具有重大贡献，PM1.1、PM2.1和PM2.1-9.0中含碳气溶胶总量（total carbonaceous aerosols，TCA）分别占到（49±20）%、（45±19）%和（19±7）%。PM9.0中的含碳气溶胶主要富集在PM2.1乃至PM1.1中。颗粒物浓度谱分布及含碳气溶胶富集量呈显著季节变化，由于采暖过程秋冬季各粒径段有机碳（organic carbon，OC）和元素碳（elemental carbon，EC）的浓度均增加，秋、冬季节细颗粒物中OC浓度可高达44.0±38.3、78.5±30.2 μg m-3，EC浓度分别为3.5±1.6、8.5±6.8 μg m-3。各个季节OC和EC在总悬浮颗粒物（total suspended particulate，TSP）中的几何平均直径（geometric mean diameter，GMD）均集中在较小粒径段。粗颗粒物中OC的GMD在春夏季较高，秋季减少，而冬季最低。而粗颗粒物中EC的GMD则是冬季最高，夏季最低。保定〈0.4 μm的颗粒物中OC/EC比值4个季节的水平较为稳定，春、夏、秋、冬季OC/EC比值分别为5.2、3.5、4.1和5.4，来源主要为交通和燃煤。其余几个粒径段的颗粒物的来源更为复杂，其来源主要为燃煤、木材和生物质。

英文摘要：

Atmospheric particulate matter （PM） pollution is serious in Baoding, an industrial city in North China. Carbonaceous aerosols are key components of particles of various sizes. Total carbonaceous aerosols （TCA） account for （49±20）%, （45±19）%, and （19±7）% of PM1.1, PM2.1, and PM2.1-9.0, respectively. The spectral distribution and the amount of enrichment in particulate matter concentration show seasonal variations. During autumn and winter, organic carbon （OC） concentrations in fine particulate matter were 44.0±38.3 and 78.5±30.2 μg m-3 and elemental carbon （EC） concentrations in fine particulate matter were 3.5±1.6 and 8.5±6.8 μg m-3, respectively. The geometric mean diameter （GMD） of OC and EC in the whole size range was found to be centered in fine particles. The GMD of the coarse mode （≥2.1 μm） was found to be larger in spring and summer and smaller in autumn and winter. However, the GMD of the coarse mode for EC showed the opposite tendency. The average OC/EC ratios in particles with a diameter less than 0.4 μm were 5.2 in spring, 3.5 in summer, 4.1 in autumn, and 5.4 in winter, respectively. The main origin of the particles below 0.4 μm was local vehicular exhaust, while the carbonaceous particles in other size modes mainly came from combustion of coal and burning of biomass.