Abstract：
Over the past two decades the Global South is witnessing unprecedented economic transformation and Asian Cities in particular have a remarkable upsurge. Coimbatore, an industrial city in Southern India with an estimated population of 2 million (in 2022) is witnessing a rapid transition in terms of infrastructure development. In this context, the present study attempts to assess the particulate matter (PM10 and PM2.5) emissions at road network construction sites and the heavy metal fractionation in the road dust/sediment samples with a core focus to quantify the bioavailable fraction of metals (Fe, Cu, Cr, Cd, Pb and Ni) and its source apportionment in the road side dust/sediment samples. About 60 composite road dust/sediment samples were collected for heavy metal fractionation analysis in the six arterial roads that undergo core developments like construction of road over bridges, additional road incorporation and street expansions. PM monitoring revealed that 24 h average PM2.5 (47 µg/m3) and PM10 (69 µg/m3) concentrations at many construction sites exceeded 24 h average recommended by WHO guidelines [PM2.5 (15 µg/m3) and PM10 (45 µg/m3), respectively]. The bioavailable fractions of Fe, Cu, Cr and Cd are notably higher in the roadside sediment samples at road construction sites. Health Risk assessment, such as carcinogenic risks (Children-4.41 × 10-2, Adult-3.598 × 10-6) and non-carcinogenic risks, inferred substantial risks at high intensity construction sites with statistical analyses, including PCA and cluster analysis, indicating considerable anthropogenic influences in the heavy metal fractions.
摘要：
在过去的二十年中，全球南方正在经历前所未有的经济转型，特别是亚洲城市的崛起。Coimbatore,印度南部的一个工业城市，估计有200万人口（2022年）正在经历基础设施发展方面的快速转变。在这种情况下，本研究试图评估道路网络建设现场的颗粒物（PM10和PM2.5）排放和道路灰尘/沉积物样品中的重金属分馏，核心重点是量化金属的生物可利用分数（Fe，Cu,Cr,Cd,路侧灰尘/沉积物样品中的Pb和Ni）及其来源分配。收集了大约60个复合道路灰尘/沉积物样品，用于在六个主干道中进行重金属分馏分析，这些主干道经过核心开发，例如在桥梁上修建道路，额外的道路合并和街道扩建。PM监测显示，许多建筑工地的24小时平均PM2.5(47微克/立方米)和PM10(69微克/立方米)浓度超过了世卫组织指南建议的24小时平均[PM2.5(15微克/立方米)和PM10(45微克/立方米)。分别]。Fe的生物可利用部分，Cu,道路施工现场的路边沉积物样品中的Cr和Cd明显更高。健康风险评估,如致癌风险（儿童-4.41×10-2，成人-3.598×10-6）和非致癌风险，通过统计分析推断高强度建筑工地的重大风险，包括PCA和聚类分析，表明重金属馏分中存在相当大的人为影响。
