Roadside air quality and implications for control measures: A case study of Hong Kong
Roadside air quality and implications for control measures: A case study of Hong Kong
复制标题
DOI：
10.1016/j.atmosenv.2016.04.033
复制
发表时间：
2016-07-01
影响因子：
5
通讯作者：
Lee, H. C.
中科院分区：
文献类型：
--
作者：
Ai, Z. T.;Mak, C. M.;Lee, H. C.
与交通有关的空气污染是香港等人口稠密市区的主要环境问题之一。香港政府实施了一系列控制措施，以减少与交通有关的空气污染物，包括为欧盟II和欧盟III巴士安装选择性催化还原装置，以减少二氧化氮（NO2）的排放。为了揭示真实的路边空气质量并评估控制措施的有效性，本研究首先分析了两个政府路边监测站记录的近六年与交通有关的污染物浓度数据，然后对选定的五条道路附近行人水平的污染物浓度进行了现场测量。考虑到可控硅装置有可能产生氨泄漏作为二次污染物，对公交车站和路边的氨水平进行了特别关注。分析了交通强度、街道形态和季节等重要影响因素。政府实施的控制措施对减少交通排放是有效的。2014年，只有二氧化氮无法达到香港全年的空气质素指标。然而，重要的是要发现，颗粒物，而不是二氧化氮，对乘客和行人造成潜在的短期暴露风险。根据研究结果，我们提出了具体的控制措施，以进一步改善路边空气质素。(C) 2016 Elsevier Ltd.版权所有。
Traffic related air pollution is one of major environmental issues in densely populated urban areas including Hong Kong. A series of control measures has been implemented by Hong Kong government to cut traffic related air pollutants, including retrofitting the Euro II and Euro III buses with selective catalytic reduction (SCR) devices to lower nitrogen dioxide (NO2) emissions. In order to reveal the real-life roadside air quality and evaluate the effectiveness of the control measures, this study first analyzed the recent six-year data regarding concentrations of pollutants typically associated with traffic recorded in two governmental roadside monitoring stations and second conducted on-site measurements of concentration of pollutants at pedestrian level near five selected roads. Given that there is a possibility of ammonia leakage as a secondary pollutant from SCR devices, a special attention was paid to the measurements of ammonia level in bus stations and along roadsides. Important influencing factors, such as traffic intensity, street configuration and season, were analyzed. Control measures implemented by the government are effective to decrease the traffic emissions. In 2014, only NO2 cannot achieve the annual air quality objective of Hong Kong. However, it is important to find that particulate matters, rather than NO2, post potentially a short-term exposure risk to passengers and pedestrians. Based on the findings of this study, specific control measures are suggested, which are intended to further improve the roadside air quality. (C) 2016 Elsevier Ltd. All rights reserved.