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Haze in the Klang Valley of Malaysia

Keywood, M. D. and Ayers, G. P. and Gras, J. L. and Boers, R. and Leong, C. P. (2003) Haze in the Klang Valley of Malaysia. Atmospheric Chemistry and Physics Discussions, 3 (1). pp. 615-653. ISSN 1680-7375. doi:10.5194/acp-3-591-2003.

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Continuous measurements of dry aerosol light scattering (Bsp) were made at two sites in the Klang Valley of Malaysia between December 1998 and December 2000. In addition 24-h PM2.5 samples were collected on a one-day-in-six cycle and the chemical composition of the aerosol was determined. Periods of excessive haze were defined as 24-h average Bsp values greater than 150 Mm-1 and these occurred on a number of occasions, between May and September 1999, during May 2000, and between July and September 2000. The evidence for smoke being a significant contributor to aerosol during periods of excessive haze is discussed and includes features of the aerosol chemistry, the diurnal cycle of Bsp, and the coincidence of forest fires on Sumatra during the southwest (SW) monsoon period, as well as transport modelling for one week of the southwest Monsoon of 2000. The study highlights that whilst transboundary smoke is a major contributor to poor visibility in the Klang Valley, smoke from fires on Peninsular Malaysia is also a contributor, and at all times, the domestic source of secondary particle production is present.

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Additional Information:© 2006 Author(s). This work is licensed under a Creative Commons Attribution, NonCommercial and ShareAlike Licence. Received: 15 November 2002 – Accepted: 16 January 2003 – Published: 10 February 2003 The authors would like to thank staff from the Malaysian Meteorological Service, Malaysian Department of Environment, Alam Sekitar Malaysia and the Aerosol Team of CSIRO Atmospheric Research. Also thanks to P. Krummel from CSIRO Atmospheric Research for his help with data analysis. We gratefully acknowledge AusAID for substantially funding the study.
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ID Code:1953
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Deposited On:25 Feb 2006
Last Modified:08 Nov 2021 19:43

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