Journal article
Ozone episodes in urban Hong Kong 1994–1999
Atmospheric environment (1994), Vol.36(12), pp.1957-1968
2002
DOI: 10.1016/S1352-2310(02)00150-4
Abstract
Summer pollution episodes in Hong Kong are related to the passage of tropical storms close to the territory. Between 1994 and 1999, there were six territory-wide ozone episodes in Hong Kong during which the Hong Kong Air Quality Objective for ozone (240
μg
m
−3, 1
h) was violated. The maximum O
3 concentration for the period was 334
μg
m
−3 recorded in August 1999. Synoptically, tropical storms were in the vicinity on all the episode days. Northwesterly/westerly winds induced by the storms are believed to cause ozone precursor emissions from local power plants in the western part of Hong Kong to impact the territory, and at the same time allowing the import of emissions from upwind sources along the mainland coast. Other important meteorological factors that contribute to the occurrence of the episode events include: stable atmospheres, morning break-up of nocturnal inversions, low winds, strong solar radiation and high temperatures. Trajectory analysis of airflows at 850
hPa confirms the long-range pollutant transport. The strong correlation between non-sea-salt sulphate (NS-SO
4) and selenium for the summer of 1999 indicates that the main source of high levels of NS-SO
4 in summer in Hong Kong is coal combustion. The correlation between arsenic (As) and vanadium (V) for the summers of 1996–1999 suggests a concomitant influence of coal and residual oil combustion in the region.
Details
- Title: Subtitle
- Ozone episodes in urban Hong Kong 1994–1999
- Creators
- Y.C Lee - University of Hong KongG Calori - ARIANET, Viale Elvezia 42, 20052 Monza(Milano), ItalyP Hills - Centre of Urban Planning and Environmental Management, The University of Hong Kong, Pokfulam Road, Hong KongG.R Carmichael - Center for Global and Regional Environmental Research and the Department of Chemical and Biochemical Engineering, The University of Iowa, Iowa City, IA, USA
- Resource Type
- Journal article
- Publication Details
- Atmospheric environment (1994), Vol.36(12), pp.1957-1968
- DOI
- 10.1016/S1352-2310(02)00150-4
- ISSN
- 1352-2310
- eISSN
- 1873-2844
- Publisher
- Elsevier Ltd
- Language
- English
- Date published
- 2002
- Academic Unit
- Civil and Environmental Engineering; Nursing; Chemical and Biochemical Engineering
- Record Identifier
- 9984003481802771
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