Air quality in Brunei Darussalam during the 1998 haze episode

Radojević, Miroslav; Hassan, Hasnah

doi:10.1016/s1352-2310(99)00118-1

Cited by 73 publications

(53 citation statements)

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“…Commonly reported are total mass, elemental composition, organic carbon/elemental carbon (OC/EC) and water-soluble ionic and organic species over a limited period of time (Gras et al, 1999;Nakajima et al, 1999;Narukawa et al, 1999;Radojevic and Hassan, 1999;Muraleedharan et al, 2000;Okada et al, 2001;Salam et al, 2003;Radzi bin Abas et al, 2004;See et al, 2007;He et al, 2010). A comprehensive characterization of aerosols carried out in Singapore on a daily basis for a year (Balasubramanian et al, 2003) revealed that a significant fraction of the total mass can be attributed to organic constituents.…”

Section: Biomass Burningmentioning

confidence: 99%

Observing and understanding the Southeast Asian aerosol system by remote sensing: An initial review and analysis for the Seven Southeast Asian Studies (7SEAS) program

Reid¹,

Hyer²,

Johnson

et al. 2013

Atmospheric Research

296

264

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Section: Biomass Burningmentioning

confidence: 99%

Observing and understanding the Southeast Asian aerosol system by remote sensing: An initial review and analysis for the Seven Southeast Asian Studies (7SEAS) program

Reid¹,

Hyer²,

Johnson

et al. 2013

Atmospheric Research

296

264

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“…Portable nephelometers have been welcomed as an advancement for assessment of human exposures to particles (Radojevic and Hassan, 1999;Ezzati et al, 2000a, b;Muraleedharan and Radojevic, 2000;Quintana et al, 2000Quintana et al, , 2001Williams et al, 2000;Rea et al, 2001;Lanki et al, 2002;Liu et al, 2003;Wallace et al, 2003Wallace et al, , 2006Balakrishnan et al, 2004;Wu et al, 2005a). However, most previously published environmental investigations of nephelometer performance relative to gravitational determinations depict controlled laboratory settings or relatively low (1-60 mg/m 3 ) particle concentrations (Richards et al, 1999;Howard-Reed et al, 2000;Quintana et al, 2000;Sioutas et al, 2000;Lanki et al, 2002;Liu et al, 2002;Wallace et al, 2003Wallace et al, , 2006Allen et al, 2004;Chakrabarti et al, 2004;Jenkins et al, 2004;Wu et al, 2005b).…”

Section: Introductionmentioning

confidence: 99%

Field performance of a nephelometer in rural kitchens: effects of high humidity excursions and correlations to gravimetric analyses

Fischer¹,

Koshland²

2006

J Expo Sci Environ Epidemiol

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Rural kitchens of solid-fuel burning households constitute the microenvironment responsible for the majority of human exposures to health-damaging air pollutants, particularly respirable particles and carbon monoxide. Portable nephelometers facilitate cheaper, more precise, time-resolved characterization of particles in rural homes than are attainable by gravitational methods alone. However, field performance of nephelometers must contend with aerosols that are highly variable in terms of chemical content, size, and relative humidity. Previous field validations of nephelometer performance in residential settings explore relatively low particle concentrations, with the vast majority of 24-h average gravitational PM 2.5 concentrations falling below 40 mg/m 3 . We investigate relationships between 24-h gravitational particle measurements and nephelometric data logged by the personal DataRAM (pDR) in highly polluted rural Chinese kitchens, where gravitationally determined 24-h average respirable particle concentrations were as high as 700 mg/m 3 . We find that where relative humidity remained below 95%, nephelometric response was strongly linear despite complex mixtures of aerosols and variable ambient conditions. Where 95% relative humidity was exceeded for even a brief duration, nephelometrically determined 24-h mean particle concentrations were nonsystematically distorted relative to gravitational data, and neither concurrent relative humidity measurements nor use of robust statistical measures of central tendency offered means of correction. This nonsystematic distortion is particularly problematic for rural exposure assessment studies, which emphasize upper quantiles of time-resolved particle measurements within 24-h samples. Precise, accurate interpretation of nephelometrically resolved short-term particle concentrations requires calibration based on short-term gravitational sampling.

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“…Haze events have been recorded in 1983, 1990, 1991, 1994, 1997(Radojevic and Hassan 1999, Muraleedharan et al 2000. Koe et al (2001) noted that reduced visibility in Malaysia during the 1997 haze episode was the result of long range transport of smoke from Sumatra.…”

Section: Introductionmentioning

confidence: 99%

Haze in the Klang Valley of Malaysia

et al. 2003

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Abstract. 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-hour 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-hour 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 from biomass burning being a significant contributor to aerosol during periods of excessive haze is discussed. For example, during periods of excessive haze, the chemical composition of the aerosol showed enhanced concentrations of elemental carbon, organic carbon and non-seasalt potassium. The diurnal cycle of Bsp and PM10 was disturbed from its usual pattern of maxima overnight and minuma during the day with morning and afternoon traffic peaks, and instead showed a maximum peak during the middle of the day. Periods of excessive haze were coincident with the presence of forest fires on Sumatra during the southwest (SW) monsoon period, the influence of which are demonstrated by transport modelling for one week of the SW 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. In addition the uniform concentration of non-seasalt sulfate in PM2.5 at both sites over the entire sampling period suggests the presence of a domestic source of secondary aerosol production in the Klang Valley.

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Air quality in Brunei Darussalam during the 1998 haze episode

Cited by 73 publications

References 0 publications

Observing and understanding the Southeast Asian aerosol system by remote sensing: An initial review and analysis for the Seven Southeast Asian Studies (7SEAS) program

Observing and understanding the Southeast Asian aerosol system by remote sensing: An initial review and analysis for the Seven Southeast Asian Studies (7SEAS) program

Field performance of a nephelometer in rural kitchens: effects of high humidity excursions and correlations to gravimetric analyses

Haze in the Klang Valley of Malaysia

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