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Title: Indoor human exposure to size-fractionated aerosols during the 2015 Southeast Asian smoke haze and assessment of exposure mitigation strategies
Authors: Sharma, R 
Balasubramanian, R 
Keywords: Aerosols
Air cleaners
Air quality
Health risks
Redox reactions
Risk assessment
Trace elements
Aerodynamic diameters
Ambient air quality
Exposure mitigation
Indoor air quality
Potential health risks
Trans-boundary air pollutions
Ventilated indoor environments
Indoor air pollution
air quality
assessment method
atmospheric pollution
biomass burning
cleaner production
health impact
health risk
indoor air
pollution exposure
risk assessment
transboundary cooperation
transboundary pollution
Singapore [Southeast Asia]
Issue Date: 2017
Citation: Sharma, R, Balasubramanian, R (2017). Indoor human exposure to size-fractionated aerosols during the 2015 Southeast Asian smoke haze and assessment of exposure mitigation strategies. Environmental Research Letters 12 (11) : 114026. ScholarBank@NUS Repository.
Abstract: The 2015 smoke haze episode was one of the most severe and prolonged transboundary air pollution events ever seen in Southeast Asia (SEA), affecting the air quality of several countries within the region including Indonesia, Malaysia and Singapore. The 24 h mean outdoor PM2.5 (particulate matter (PM) with aerodynamic diameter ? 2.5 ?m) concentrations ranged from 72-157 ?g m-3 in Singapore during this episode, exceeding the WHO 24 h mean PM2.5 guidelines (25 ?g m-3) several times over. The smoke haze episode not only affected ambient air quality, but also indoor air quality due to the migration of PM of different sizes from the outdoor to the indoor environment. Despite the frequent occurrence of smoke haze episodes over the years, their potential health impacts on indoor building occupants remain largely unknown in SEA due to the lack of systematic investigations and observational data. The current work was carried out in Singapore to assess human exposure to size-resolved PM during the 2015 smoke haze episode, and to evaluate the effectiveness of exposure mitigation measures in smoke-haze-impacted naturally ventilated indoor environments. The potential health risks associated with exposure to PM2.5 were assessed based on the concentrations of redox active particulate-bound trace elements, which are known to be harmful to human health, with and without exposure mitigation. Overall, it was observed that human health exposure to PM2.5 and its carcinogenic chemical components was reduced substantially by 62% (p < 0.05) while using an air cleaner. However, extremely small hazardous particles were only partially removed by the air cleaner and remain a matter of concern for public health. © 2017 The Author(s). Published by IOP Publishing Ltd.
Source Title: Environmental Research Letters
ISSN: 17489318
DOI: 10.1088/1748-9326/aa86dd
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