Pollutants deposited on road surfaces and distributed in the environment are a source of nonpoint pollution. Field data are traditionally hard to collect from roads because of constant traffic. In this study, in cooperation with the traffic administration, the dry deposition on and road runoff from urban roads was measured in Taipei City and New Taipei City, Taiwan. The results showed that the dry deposition is 2.01–5.14 g/m2·day and 78–87% of these solids are in the 75–300 μm size range. The heavy metals in the dry deposited particles are mainly Fe, Zn, and Na, with average concentrations of 34,978, 1,519 and 1,502 ppm, respectively. Elevated express roads show the highest heavy metal concentrations. Not only the number of vehicles, but also the speed of the traffic should be considered as factors that influence road pollution, as high speeds may accelerate vehicle wear and deposit more heavy metals on road surfaces. In addition to dry deposition, the runoff and water quality was analyzed every five minutes during the first two hours of storm events to capture the properties of the first flush road runoff. The sample mean concentration (SMC) from three roads demonstrated that the first flush runoff had a high pollution content, notably for suspended solid (SS), chemical oxygen demand (COD), oil and grease, Pb, and Zn. Regular sweeping and onsite water treatment facilities are suggested to minimize the pollution from urban roads.
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机译：沉积在路面上并分布在环境中的污染物是非点源污染的来源。传统上，由于交通持续，现场数据很难从道路上收集。在这项研究中，与交通管理部门合作，在台湾台北市和台湾新北市测量了城市道路的干沉降和道路径流。结果表明，干沉降量为2.01-5.14 g / m2·天，其中78-87％的固体粒径在75-300μm之间。干沉积颗粒中的重金属主要是Fe，Zn和Na，平均浓度分别为34,978、1,519和1,502 ppm。高架快速路显示出最高的重金属浓度。不仅车辆的数量，而且交通的速度都应被视为影响道路污染的因素，因为高速可能会加速车辆的磨损并在路面上沉积更多的重金属。除了干沉降外，在暴风雨的前两个小时内每五分钟分析一次径流和水质，以捕获第一条平整道路径流的特性。来自三条道路的样品平均浓度（SMC）表明，第一冲水径流具有较高的污染含量，尤其是对于悬浮固体（SS），化学需氧量（COD），油脂，铅和锌。建议定期清扫和现场水处理设施，以尽量减少城市道路的污染。
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