This study aimed to investigate the variability of Black Carbon (BC) at one traffic site in Istanbul as a function of other pollutants, traffic density and meteorological parameters in order to identify the source and determinants of concentration. This was carried out through the statistical analyses of data measured in the period of May 2016–December 2018. The mean concentration of BC was observed as 6.5 ± 3.5 μg m⁻³. Daytime BC was observed to be higher than nighttime during the weekdays but slightly lower at the weekend, similar to oxides of nitrogen (NO_x). However, nighttime traffic during the weekend was found to be higher than the weekdays. The diurnal pattern showed two peaks of BC corresponding to the traffic rush hours in the morning and evening. Since the traffic density did not change during the day, the sharp decrease after the morning rush hour is attributed to enhanced atmospheric mixing, due to an increased wind speed and boundary layer depth. In addition, polar plots indicated that the only major source of BC is in the vicinity of the monitoring site, consistent with road traffic. Moreover, episodic north-easterly atmospheric transport events from the ship activity in the Bosphorus in summer can contribute to elevated BC concentrations. These results suggest that vehicular emissions heavily impact the environmental concentrations of BC and affect NO_x concentrations more than other pollutants. BC concentrations are highly correlated with NO_x, reflecting a common source in diesel vehicle emissions. Since the proportion of diesels in total vehicles in Istanbul is increasing every year, there may be future increases in BC and NO_x unless exhaust after-treatment works effectively on newer vehicles entering the fleet.

这项研究旨在调查伊斯坦布尔一个交通站点的黑碳（BC）随其他污染物，交通密度和气象参数的变化，从而确定浓度的来源和决定因素。这是通过对2016年5月至2018年12月期间测得的数据进行统计分析而得出的。BC的平均浓度为6.5±3.5μgm ^-3。白天的BC值在工作日高于夜间，但在周末的值略低，类似于氮氧化物（NO _x）。但是，发现周末的夜间流量高于工作日。昼夜模式显示了两个BC高峰，分别对应于早上和晚上的交通高峰时间。由于交通密度在一天中没有变化，因此，由于风速和边界层深度的增加，早上高峰时间之后的急剧下降归因于增强的大气混合。此外，极地图表明，卑诗省的唯一主要来源是在监测点附近，与道路交通情况一致。此外，夏季博斯普鲁斯海峡船舶活动引起的东北向大气的偶发性大气迁移事件可能导致BC浓度升高。这些结果表明，车辆排放严重影响了BC的环境浓度并影响了NO _x。浓度高于其他污染物。BC浓度高度相关与NO _X，反映柴油车辆废气中的共用源极。由于在伊斯坦布尔总车辆柴油的比例每年都在增加，有可能在未来增加BC和NO _X除非排在进入车队的新车型有效地工作后处理。