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Traffic control oriented impact on the persistence of urban air pollutants: A causeway bay revelation during emergency period

机译：面向交通控制的对城市空气污染物持久性的影响：紧急时期的铜锣湾启示

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摘要

The continuous traffic flow is always considered to take a great extent responsibility for the air quality deterioration in urban areas. Meanwhile, traffic control is assumed to be one of the most effective ways to mitigate the high concentration situation as this may cut off the emission directly and satisfy the air quality objectives. Unfortunately, the overdevelopment of central business district area in megacities not only complicates the control plan, but also troubles the process of plan assessment. Because of the road blockages caused by the radical behavior during the Hong Kong protest in 2014, it offers an unexpected chance to evaluate the influence of traffic control oriented plan on urban (i.e., Causeway Bay) air pollution. Hence, we here investigated the six air pollutants concentrations that measured in the time series before, during and after the Hong Kong Protest period. The impact of traffic flow restriction on pollutants' persistence has been quantified both qualitatively and quantitatively in this study. The results showed that the persistence of pollutants was a general property in Causeway Bay which dominated by the traffic flow pattern. The road blockages, considered as one kind of extreme traffic control plan, would strengthen the persistence of most pollutants (except ozone). Moreover, it also indicated that comprehensive consideration and further balance among different pollutants were necessary when try to reduce pollution in urban area by traffic control. (C) 2017 Elsevier Ltd. All rights reserved.
机译：人们一直认为，持续的交通流量在很大程度上负责城市地区的空气质量恶化。同时，交通管制被认为是缓解高浓度情况的最有效方法之一，因为这可以直接切断排放并满足空气质量目标。不幸的是，特大城市中央商务区的过度开发不仅使控制计划复杂化，而且也困扰着计划评估的过程。由于2014年香港抗议活动中的激进行为造成道路阻塞，因此，这为评估交通控制计划对城市（即铜锣湾）空气污染的影响提供了意想不到的机会。因此，我们在这里调查了在香港抗议时期之前，之中和之后的时间序列中测得的六种空气污染物浓度。本研究已定性和定量地量化了交通流量限制对污染物持久性的影响。结果表明，污染物的持久性是铜锣湾的一个普遍属性，主要由交通流模式主导。道路阻塞被认为是一种极端的交通管制计划，它将加强大多数污染物（臭氧除外）的持久性。此外，它还表明，在尝试通过交通管制减少城市污染时，有必要综合考虑并进一步平衡不同污染物之间的关系。 （C）2017 Elsevier Ltd.保留所有权利。

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