Relationships between visibility and selected air pollutants in the Klang Valley

Hazy conditions over the Klang Valley which last appeared in October 1991, began to reappear in August 1994. This study which was conducted during the beginning period of the haze episode, represents a preliminary attempt to identify the types of air pollutants that may be most associated with visib...

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Main Authors:	Jamal Hisham Hashim, Zailina Hashim, Azman Zainal Abidin
Format:	Article
Published:	Universiti Kebangsaan Malaysia 1996
Online Access:	http://journalarticle.ukm.my/4148/ http://journalarticle.ukm.my/4148/

id	ukm-4148
recordtype	eprints
spelling	ukm-41482012-05-23T01:50:55Z http://journalarticle.ukm.my/4148/ Relationships between visibility and selected air pollutants in the Klang Valley Jamal Hisham Hashim, Zailina Hashim, Azman Zainal Abidin, Hazy conditions over the Klang Valley which last appeared in October 1991, began to reappear in August 1994. This study which was conducted during the beginning period of the haze episode, represents a preliminary attempt to identify the types of air pollutants that may be most associated with visibility reduction. Visibility and rainfall data were obtained from the Subang Airport Meteorological Station. The levels of selected air pollutants which include respirable particulated (PM10), nitrogen oxide, nitrogen dioxide, sulfur dioxide, carbon monoxide and ozone were measured from a station located at Dewan Bandaraya Kuala Lumpur. Data for visibility, rainfall and air pollutants were collected from August 1 to September 4, 1994, giving a total of 35 - 24 hour sampling days. On 2 of the 4 days with poor visibility, the Recommended Malaysian Air Quality Guidelines for PM10, nitrogen dioxide and sulfur dioxide were exceeded. Pearson correlation analysis showed statistically significant inverse correlations between visibility and PM10, nitrogen oxide, nitrogen dioxide and carbon monoxide, indicating pollutants from motor vehicles and other local combustion sources as important contributors to visibility reduction. A statistically significant inverse correlation between visibility and rainfall also indicates the ineffectiveness of light rain in despersing the haze. This study concludes that visibility in the Klang Valley may be worsening over the years; that local air pollution sources may play a much more important role in visibility reduction and the haze problem, than what might be realised; and that atmospheric PM10 may reach unhealthy levels at times. Comparison with other studies strongly support these conclusions. Universiti Kebangsaan Malaysia 1996-07 Article PeerReviewed Jamal Hisham Hashim, and Zailina Hashim, and Azman Zainal Abidin, (1996) Relationships between visibility and selected air pollutants in the Klang Valley. AKADEMIKA, 49 . pp. 83-93. ISSN 0126-5008 http://www.ukm.my/penerbit/jdem49-5.htm
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
description	Hazy conditions over the Klang Valley which last appeared in October 1991, began to reappear in August 1994. This study which was conducted during the beginning period of the haze episode, represents a preliminary attempt to identify the types of air pollutants that may be most associated with visibility reduction. Visibility and rainfall data were obtained from the Subang Airport Meteorological Station. The levels of selected air pollutants which include respirable particulated (PM10), nitrogen oxide, nitrogen dioxide, sulfur dioxide, carbon monoxide and ozone were measured from a station located at Dewan Bandaraya Kuala Lumpur. Data for visibility, rainfall and air pollutants were collected from August 1 to September 4, 1994, giving a total of 35 - 24 hour sampling days. On 2 of the 4 days with poor visibility, the Recommended Malaysian Air Quality Guidelines for PM10, nitrogen dioxide and sulfur dioxide were exceeded. Pearson correlation analysis showed statistically significant inverse correlations between visibility and PM10, nitrogen oxide, nitrogen dioxide and carbon monoxide, indicating pollutants from motor vehicles and other local combustion sources as important contributors to visibility reduction. A statistically significant inverse correlation between visibility and rainfall also indicates the ineffectiveness of light rain in despersing the haze. This study concludes that visibility in the Klang Valley may be worsening over the years; that local air pollution sources may play a much more important role in visibility reduction and the haze problem, than what might be realised; and that atmospheric PM10 may reach unhealthy levels at times. Comparison with other studies strongly support these conclusions.
format	Article
author	Jamal Hisham Hashim, Zailina Hashim, Azman Zainal Abidin,
spellingShingle	Jamal Hisham Hashim, Zailina Hashim, Azman Zainal Abidin, Relationships between visibility and selected air pollutants in the Klang Valley
author_facet	Jamal Hisham Hashim, Zailina Hashim, Azman Zainal Abidin,
author_sort	Jamal Hisham Hashim,
title	Relationships between visibility and selected air pollutants in the Klang Valley
title_short	Relationships between visibility and selected air pollutants in the Klang Valley
title_full	Relationships between visibility and selected air pollutants in the Klang Valley
title_fullStr	Relationships between visibility and selected air pollutants in the Klang Valley
title_full_unstemmed	Relationships between visibility and selected air pollutants in the Klang Valley
title_sort	relationships between visibility and selected air pollutants in the klang valley
publisher	Universiti Kebangsaan Malaysia
publishDate	1996
url	http://journalarticle.ukm.my/4148/ http://journalarticle.ukm.my/4148/
first_indexed	2023-09-18T19:40:45Z
last_indexed	2023-09-18T19:40:45Z
_version_	1777405574048120832

Relationships between visibility and selected air pollutants in the Klang Valley

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