Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61375
Title: Roadside air quality and implications for control measures : a case study of Hong Kong
Authors: Ai, ZT
Mak, CM 
Lee, HC
Keywords: Air pollution
On-site measurement
Roadside air quality
Traffic related pollutants
Urban environment
Issue Date: 2016
Publisher: Pergamon Press
Source: Atmospheric environment, 2016, v. 137, p. 6-16 How to cite?
Journal: Atmospheric environment 
Abstract: 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.
URI: http://hdl.handle.net/10397/61375
ISSN: 1352-2310
EISSN: 1873-2844
DOI: 10.1016/j.atmosenv.2016.04.033
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