NDLI: Distribution of polycyclic aromatic hydrocarbons in the atmosphere of Hong Kong

Content Provider	Royal Society of Chemistry (RSC)
Author	Lam, C. H. Louie, Peter K. K. Sin, Della W. M. Wong, Y. C. Choi, Y. Y.
Copyright Year	2003
Abstract	This paper reports the monitoring results of eleven polycyclic aromatic hydrocarbons (PAHs), four to six-ring, at two urban sites–Central & Western (CW) and Tsuen Wan (TW) in Hong Kong from January to December 2000; and the findings of a study conducted in 2001 of the partitioning of the gaseous and particulate phases of PAHs. The sum of the eleven PAHs under study (ΣPAHs) was found to range from 6.46 to 38.8 ng m−3. The annual mean levels at 12.2 ng m−3 and 15.8 ng m−3 for CW and TW respectively are comparable to those recorded for the previous two years and are also within the reported ranges for other metropolitan cities in the Asia Pacific region. Amongst the selected eleven PAHs, fluoranthene and pyrene were the two most abundant found in the urban atmosphere of Hong Kong during the study period accounting for approximately 80% of the total PAHs. The ratios of benzo(a)pyrene to benzo(g,h,i)perylene (BaP/BghiP) and indeno(1,2,3-cd)pyrene to benzo(g,h,i)perylene (IDP/BghiP) indicate that diesel and gasoline vehicular exhausts were the predominant local emission sources of PAHs. Seasonal variations with high winter to summer ratios for each of the individual PAHs (CW: 1.6–16.7 and TW: 0.82–8.2) and for ΣPAHs (CW: 1.9 and TW: 1.8) and a spatial variation of BaP amongst the air monitoring stations are noted. Results of correlation studies illustrate that local meteorological conditions such as ambient temperature, solar radiation, wind speed and wind direction have significant impact on the concentrations of atmospheric PAHs accounting for the observed seasonal variations. A snapshot comparison of the concentrations of PAHs at four sites including a roadside site, a rural site and the two regular urban sites CW and TW was also performed using the profiles of PAHs recorded on two particulate episode days in March 2000.
Starting Page	989
Ending Page	996
Page Count	8
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	5
Issue Number	6
Journal	Journal of Environmental Monitoring
DOI	10.1039/b310095b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	CW Tsuen Wan TW Hong Kong Asia Pacific region Polycyclic aromatic hydrocarbon Continuous wave Pyrene Perylene Solar irradiance
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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