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Research Article
ScienceAsia 31 (2005): 359-367 |doi: 10.2306/scienceasia1513-1874.2005.31.359
Exposure to PM-10 of Shop House Dwellers
in Bangkok, Thailand
Pensri Watchalayann,a Thares Srisatit,b* Daniel J. Wattsc and Pichaya Rachadawongb
ABSTRACT: Relationships between personal PM-10 exposure and indoor and outdoor PM-10 concentrations
were investigated among 28 non-smoking participants who lived in roadside buildings. The nine repeated
measurements covered 3 seasons and were conducted with individuals living in 14 shop houses on Sukhumvit
Road, Bangkok. The averages of personal exposure, and indoor and outdoor PM-10 concentrations were
81.6, 74.6 and 130.7 ?g/m3 respectively. The overall mean of the outdoor concentrations exceeded both the
indoor and personal PM-10 exposure concentrations, and the levels were higher in winter than in the summer
or rainy seasons. Variations in the indoor PM-10 concentrations were found from floor to floor, with the
highest levels measured on the first floor of the shop house. Even for people living in the same houses,
personal PM-10 exposure concentrations could be different. Nonetheless, the result showed that the personal
PM-10 exposure level was well correlated with the outdoor concentration. The correlation between personal
exposure and outdoor PM-10 concentration was moderate with a median Pearson’s R correlation of 0.706.
Excluding a house with a parking space, the median Pearson’s R correlation increased to 0.760. In addition
to the contributions from the outdoor PM-10 concentrations, the personal PM-10 exposure concentrations
tended to be higher under conditions of incense burning, exposure to tobacco smoke, door opening, and
during the winter season. However, sleeping in a bedroom with an air conditioning system tended to lower
the personal PM-10 exposure concentrations. This finding supported a conclusion that outdoor PM-10
concentration could be used as an exposure surrogate in a health impact epidemiological study for people
living this life-style.
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a National Research Center for Environmental and Hazardous Waste Management, Chulalongkorn
University, Bangkok 10330, Thailand.
b Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok
10330, Thailand.
c Otto H. York Center for Environmental Engineering and Science, New Jersey Institute of Technology,
Newark, New Jersey 07102-1982, USA.
* Corresponding author, E-mail: fentss@eng.chula.ac.th
Received 8 Dec 2004,
Accepted 17 Jun 2005
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