The present paper reports chemistry and fluxes of dust-carbon mixed coarse particles. For the purpose of this study, different carbonaceous fractions i.e. organic carbon ((OC), elemental carbon (EC) and carbonate carbon (CC) of atmospheric dust and their respective local soils were quantified at three sites of National Capital Region (NCR) of Delhi viz. Jawaharlal Nehru University campus (JNU), Connaught Place (CP) and Vishali area of Ghaziabad (GB). It has been observed that the OC and EC levels were approximately five to nine times higher in urban atmospheric dust than their corresponding soils, whereas CC levels were about three times higher than the corresponding soils. Average dustfall fluxes were significantly different at all the sites due to their different land-use patterns. At urban background site (JNU), the dust flux was lowest (172 mg/m2/day) followed by CP, a commercial site, (192 mg/m2/day) and GB, an industrial/residential area, (302 mg/m2/day). Similar to the dustfall pattern, the mean values of OC, EC and CC deposition fluxes were also observed to be lowest at JNU (9.2, 0.8 and 1.0 mg/m2/day, respectively) as compared to CP (12.2, 1.2 and 1.3 mg/m2/day, respectively) and GB sites (11.1, 1.1 and 1.4 mg/m2/day, respectively). Interestingly, unlike fine mode, different correlation pattern of OC and EC in coarse mode dust aerosols at three sites has suggested their independent deposition processes and source contribution. Fluxes of major water soluble inorganic ions (Na+, NH4+, K+, Ca2+, Mg2+, F−, Cl−, NO3− and SO42−) were also determined. Ca2+, Cl− and SO42− were found to be the major ionic species of water soluble fraction of the urban dust at all the sites. These interactions are corroborated by the morphology of the mixed aerosols. High levels of measured chemical species and their spatial distribution revealed close correspondence with the local emissions from transport, industries, biomass burning, road dust and construction activities etc.

中文翻译：

---

NCR德里三个地点灰尘-碳混合粗气溶胶的化学特征和沉积通量

本论文报告了粉尘-碳混合粗颗粒的化学性质和通量。出于本研究的目的，在美国首都地区 (NCR) 的三个地点量化了大气灰尘及其各自当地土壤的不同碳质部分，即有机碳 ((OC)、元素碳 (EC) 和碳酸盐碳 (CC)。德里即贾瓦哈拉尔·尼赫鲁大学校园 (JNU)、康诺特广场 (CP) 和加济阿巴德 (GB) 的 Vishali 地区。据观察，城市大气灰尘中的 OC 和 EC 水平比相应的土壤高出大约五到九倍, 而 CC 水平大约是相应土壤的三倍。由于土地利用模式不同，所有站点的平均降尘通量显着不同。在城市背景站点（JNU），粉尘通量最低（172 毫克/平方米/天），其次是商业用地 CP（192 毫克/平方米/天）和工业/住宅区 GB（302 毫克/平方米/天）。与降尘模式相似，与 CP（12.2、1.2 和 1.3 mg）相比，JNU 的 OC、EC 和 CC 沉积通量的平均值也最低（分别为 9.2、0.8 和 1.0 毫克/平方米/天） /m2/天）和 GB 站点（分别为 11.1、1.1 和 1.4 mg/m2/天）。有趣的是，与细模式不同，三个地点粗模式尘埃气溶胶中 OC 和 EC 的不同相关模式表明它们独立的沉积过程和来源贡献。还测定了主要水溶性无机离子（Na+、NH4+、K+、Ca2+、Mg2+、F-、Cl-、NO3- 和 SO42-）的通量。Ca2+, 在所有地点，发现 Cl− 和 SO42− 是城市灰尘水溶性部分的主要离子种类。混合气溶胶的形态证实了这些相互作用。高水平的测量化学物质及其空间分布与当地交通、工业、生物质燃烧、道路扬尘和建筑活动等排放密切相关。