The diminishing importance of nitrogen dioxide emissions from road vehicle exhaust
The diminishing importance of nitrogen dioxide emissions from road vehicle exhaust
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DOI：
10.1016/j.aeaoa.2018.100002
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发表时间：
2019-01-01
影响因子：
4.6
通讯作者：
Lee, James D.
中科院分区：
文献类型：
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作者：
Carslaw, David C.;Farren, Naomi J.;Lee, James D.
在许多欧洲城市，道路机动车尾气直接排放的二氧化氮（NO2）是造成近道路环境NO2浓度的重要因素。柴油车辆及其使用的排放控制技术，如柴油氧化催化剂，已占主导地位的NO2排放的道路车辆。在这项工作中，我们总结了最近的车辆排放遥感测量结果在英国，提供了详细的信息，NO2和总氮氧化物（NO2刺NO）的排放量。我们发现，虽然新的柴油汽车和轻型商用车与高比例（通常为30%）的NO2/NOx，绝对NOx和NO2的排放量由大多数欧6车辆已大幅下降，NO2的绝对排放量已减少自2007年左右。此外，我们发现，随着车辆行驶里程的增加，NO2的量减少。综合而言，这些因素导致近年轻型柴油车辆排放的二氧化氮大幅减少，从而降低了路边的二氧化氮浓度。然而，需要通用的排放因子模型来说明NO2排放量的这些变化。
The direct emission of nitrogen dioxide (NO2) from road vehicle exhaust has been an important contributor to near-road ambient concentrations of NO2 in many European cities. Diesel vehicles and their use of emission control technologies such as Diesel Oxidation Catalysts, have dominated the emission of NO2 from road vehicles. In this work, we summarise findings from recent vehicle emission remote sensing measurements in the UK that provide detailed information on the emissions of NO2 and total NOx(NO2 thorn NO). We show that while new diesel cars and light commercial vehicles are associated with high (typically 30%) proportions of NO2/NOx, the amount of absolute NOx and NO2 emitted by most Euro 6 vehicles has decreased substantially and that absolute emissions of NO2 have been reducing since around 2007. Additionally, we find that the amount of NO2 decreases as the vehicle mileage increases. Taken together, these factors have led to substantial reductions in emissions of NO2 in recent years from light duty diesel vehicles, which has contributed to reduced roadside NO2 concentrations. There is a need however for commonly used emission factor models to account for these changes in emissions of NO2.