Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/87668
Title: Field-based investigation on vertical distribution of airborne particulate matter in multi-storey buildings
Authors: Cheong, K.W.D. 
Balasubramanian, R. 
Kalaiarasan, M.
Keywords: Fine particulate matter
Indoor air quality
Outdoor
Vertical distribution profile
Vertical transport
Issue Date: 2007
Source: Cheong, K.W.D.,Balasubramanian, R.,Kalaiarasan, M. (2007). Field-based investigation on vertical distribution of airborne particulate matter in multi-storey buildings. IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment 3 : 115-122. ScholarBank@NUS Repository.
Abstract: The aim of the study is to quantify the traffic generated particle number concentration levels (PM 2 5; PM with diameter ≤ 2.5μm) at various heights of a typical high-rise building in close proximity to a major expressway in Singapore. A 22-storey naturally-ventilated high-rise residential building located about 15m away from a major expressway was selected for the study. Three floors of the building were selected for the PM 2 5 measurements namely, the fourth storey which represented the lower floors, tenth storey which represented the mid floors and seventeenth storey which represented the upper floors of the building. Objective measurements namely particle count, wind speed, wind direction, ambient temperature and relative humidity were conducted at the selected floors. The experimental results show that PM 2 5 mean number concentration was highest at the mid floors of the building when compared to its upper and lower floors during peak and off peak hours. This could be due to the tree canopies planted alongside the expressway which deflected some of the traffic-polluted air from the lower levels towards the mid floors of the building as it traversed from the expressway towards the building and at the same time allowing the mid floors to peak earlier than other floors. Although the lower floors were close to traffic emissions, the mean particle number concentration was lower than the mid floors due to loss from deflected traffic-polluted air and also the tree canopies act as a filter and trap PM 2 5 particles as the particles traveled from the expressway through the leaves towards the lower floors of the building. The upper floors had the least fine particulate matter number concentration due to dilution.
Source Title: IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment
URI: http://scholarbank.nus.edu.sg/handle/10635/87668
ISBN: 9784861630729
Appears in Collections:Staff Publications

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