Traffic contribution of polycyclic aromatic hydrocarbons in the center of a large city
Traffic contribution of polycyclic aromatic hydrocarbons in the center of a large city
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DOI：
10.1016/1352-2310(96)00096-9
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发表时间：
1996-10-01
影响因子：
5
通讯作者：
Nielsen, T
中科院分区：
文献类型：
--
作者：
Nielsen, T
研究了哥本哈根市中心一条街道（每天60，000辆车）和街道附近的公园区域空气中颗粒PAH和其他空气污染物（烟灰、CO、NO、气体NOy、SO2、颗粒金属、硫酸盐）的存在情况。测定了多环芳烃的日变化。PAH的组成也确定了在空气中的街道只进行柴油巴士。街道空气中苯并（a）芘和苯并（e）芘的浓度分别为4.4 +/- 1.2和4.4 +/- 0.7 ng m（-3），公园地区空气中的浓度分别为1.4 +/- 0.6和1.3 +/- 0.3 ng m（-3）。调查涵盖了冬季的1月至3月。冬季温和，平均气温为摄氏2.8度。街道中PAH的主要来源是交通。在城市公园地区，交通也是一个重要的来源，但不是主要来源。应用BeP作为PAH指标，估计街道交通贡献为80%。工作日分布如下：工作日：90%，周末：60%。在城市公园区，交通贡献估计为40%。确定了城市交通PAH排放概况。街道空气中的PAH浓度与城市交通排放浓度非常接近。PAH的日变化在上午和下午的高峰期和夜间的最低浓度，是非常接近的交通气体，CO，NO和气体NOy的日变化。开发并应用了一种区分汽油车和柴油车多环芳烃贡献的方法。结果表明，柴油车对PAH的贡献约占交通总贡献的2/3。巴士改用较轻的柴油燃料，似乎令街道空气中的多环芳烃水平轻微下降。版权所有（C）1996 Elsevier Science Ltd
The presence of particulate PAH and other air pollutants (soot, CO, NO, gas NOy, SO2, particulate metals, sulfate) in the air in a street (60,000 vehicles each day) in Central Copenhagen and in a park area adjacent to the street was investigated. The diurnal variation of PAH was determined. The PAH composition was also determined in the air in a street carrying only diesel buses. The concentrations of benzo(a)pyrene and benzo(e)pyrene (BeP) were 4.4 +/- 1.2 and 4.4 +/- 0.7 ng m(-3), respectively, in the street air and 1.4 +/- 0.6 and 1.3 +/- 0.3 ng m(-3), respectively, in the air in the park area. The investigation covered the winter months, January-March. The winter was mild, with a mean temperature of 2.8 degrees C. The major PAH source in the street was the traffic. In the city park area also traffic was an important source, but not the major one. Applying BeP as PAH indicator, the traffic contribution was estimated to be 80% in the street. The weekdays distribution was as follows: Working days: 90%, Weekends: 60%. In the city park area the traffic contribution was estimated to be 40%. A city traffic PAH emission profile was determined. The street air PAH profile was very close to the city traffic emission profile. The diurnal variation of PAH showed peaks in the morning and afternoon rush hours and lowest concentrations in the night hours and was very close to the diurnal variation of the traffic gases, CO, NO and gas NOy. A method for differentiating between PAH contribution from petrol vehicles and those from diesel vehicles was developed and applied. It was concluded that the PAH contribution from diesel vehicles was about 2/3 of the total PAH traffic contribution. The shift to the application of a lighter diesel fuel in buses appears to have caused a minor decrease in the street air levels of PAH. Copyright (C) 1996 Elsevier Science Ltd