Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20092
Title: Increasing trend of primary NO2 exhaust emission fraction in Hong Kong
Authors: Tian, L
Hossain, SR
Lin, H
Ho, KF
Lee, SC 
Yu, ITS
Issue Date: 2011
Source: Environmental geochemistry and health, 2011, v. 33, no. 6, p. 623-630
Abstract: Despite the successful reduction in roadside NO (x) levels, no such decrease has been detected in roadside NO2 concentration in Hong Kong. One underlying cause could be the rising primary NO2 fraction of the total emission of NO (x) . Primary NO2 can be particularly detrimental to Hong Kong because a large fraction of the population are exposed to the traffic-related primary pollutants in the street canyons formed by congested high-rise buildings. In this study, hourly mean concentration data for roadside nitrogen oxides (NO (x) ), nitrogen dioxide (NO2), and background ozone (O-3) were used to estimate the mean primary NO2 fraction from vehicle exhausts in Hong Kong. An overall increasing trend was observed for the primary NO2 fraction (f-NO2) values in all the three roadside air monitoring sites. The primary NO2 as a fraction of total NO (x) (f-NO2) increased approximately from 2% in 1998 to 13% in 2008 in Hong Kong. The two particular periods of rising f-NO2 coincided with the two implementation periods of the diesel retrofit programs for the light-duty vehicles and heavy-duty vehicles. Future vehicle emission control strategies should target not only total NO (x) but also primary NO2. Health benefit or disease burden estimates should be taken into account and updated in the process of policy planning and evaluation.
Keywords: Primary NO2
Trend
Diesel vehicle exhaust
DOC retrofitting
Health effects
Street canyon
Publisher: Springer
Journal: Environmental geochemistry and health 
ISSN: 0269-4042
EISSN: 1573-2983
DOI: 10.1007/s10653-011-9375-5
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