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Title: Observation of increases in emission from modern vehicles over time in Hong Kong using remote sensing
Authors: Lau, J
Hung, WT 
Cheung, CS 
Keywords: Vehicle emission
Remote sensing
Gaseous emission factor
Model year
Issue Date: Apr-2012
Publisher: Pergamon Press
Source: Environmental pollution, Apr. 2012, v. 163, p.14-23 How to cite?
Journal: Environmental pollution 
Abstract: In this study on-road gaseous emissions of vehicles are investigated using remote sensing measurements collected over three different periods. The results show that a high percentage of gaseous pollutants were emitted from a small percentage of vehicles. Liquified Petroleum Gas (LPG) vehicles generally have higher gaseous emissions compared to other vehicles, particularly among higher-emitting vehicles.Vehicles with high vehicle specific power (VSP) tend to have lower CO and HC emissions while petrol and LPG vehicles tend to have higher NO emissions when engine load is high. It can be observed that gaseous emission factors of petrol and LPG vehicles increase greatly within 2 years of being introduced to the vehicle fleet, suggesting that engine and catalyst performance deteriorate rapidly. It can be observed that LPG vehicles have higher levels of gaseous emissions than petrol vehicles, suggesting that proper maintenance of LPG vehicles is essential in reducing gaseous emissions from vehicles.
ISSN: 0269-7491
EISSN: 1873-6424
DOI: 10.1016/j.envpol.2011.12.021
Rights: Environmental pollution © 2011 Elsevier B.V. All rights reserved. The journal web site is located at
NOTICE: this is the author’s version of a work that was accepted for publication in Environmental pollution. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Environmental pollution, vol. 163, (Apr 2012), p. 14-23, DOI: 10.1016/j.envpol.2011.12.021
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