Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/220868
Title: Migration of particulate matter from vehicular traffic along an expressway to a naturally-ventilated building
Authors: KOH SZE YIN
Keywords: Particulate Matter
PM2.5 Count
PM2.5 Concentration
NO2 Concentration
Wind Speed
Relative Humidity
Temperature
Building
PFM
Project and Facilities Management
Cheong Kok Wai David
2013/2014 PFM
Issue Date: 8-Jul-2014
Citation: KOH SZE YIN (2014-07-08). Migration of particulate matter from vehicular traffic along an expressway to a naturally-ventilated building. ScholarBank@NUS Repository.
Abstract: Traffic-generated pollutants are one of the major sources that contribute to urban air pollution. The exposure to fine particulate matter (PM2.5) is of public concern as they can be lodged deeply into the respiratory system and result in various respiratory infections, damaging the human health. This draws an attention to examine the horizontal distribution profile of traffic-generated pollutants of a naturally-ventilated building located in close proximity to an expressway, and assess the health conditions of occupants associated with particulate matters (PM). For the purpose of this thesis, an extensive field study was conducted at a naturally-ventilated 3-storey building located near the Central Expressway (CTE) in Singapore. Few weeks of monitoring were carried out to determine the distribution of PM2.5 and nitrogen dioxide (NO2) under dry and wet conditions. Field measurements such as NO2 concentration, PM2.5 count and concentration level, wind speed, temperature and relative humidity (RH) were monitored with relevant instruments being deployed at three sampling locations respectively (one semi-outdoor and two outdoors). A survey questionnaire was carried out to evaluate the health impacts of occupants caused by the pollutants. Results have revealed that both semi-outdoor and outdoor NO2 concentrations were found higher than the United States Environment Protection Agency (USEPA) 1-hour guideline standard and this can be harmful to occupants residing in the building. Though PM2.5 concentration level is of an acceptable range in comparison to the USEPA standard, the particles count were rather high and pose hazards as well. NO2 concentration, PM2.5 count and concentration were observed to be lower in wet condition due to the washout effect of the rain. Findings from the indoor/outdoor (I/O) ratio of NO2 and PM2.5 have revealed that pollutants were migrated from an outdoor source namely traffic emissions, into the semi-outdoors. Meteorological factors such as wind speed, RH and temperature were found to have weak correlation with PM2.5 and thus do not serve as critical determinants in affecting the distribution of these particles.
URI: https://scholarbank.nus.edu.sg/handle/10635/220868
Appears in Collections:Bachelor's Theses

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