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Characteristics of ultrafine particle sources and deposition rates in primary school classrooms
Citation
Laiman, R and He, C and Mazaheri, M and Clifford, S and Salimi, F and Crilley, LR and Mokhtar, MAM and Morawska, L, Characteristics of ultrafine particle sources and deposition rates in primary school classrooms, Atmospheric Environment, 94 pp. 28-35. ISSN 1352-2310 (2014) [Refereed Article]
Copyright Statement
Copyright 2014 Elsevier Ltd. All rights reserved.
DOI: doi:10.1016/j.atmosenv.2014.05.013
Abstract
The aim of this work was to investigate changes in particle number concentration (PNC) within naturally
ventilated primary school classrooms arising from local sources either within or adjacent to the classrooms.
We quantify the rate at which ultrafine particles were emitted either from printing, grilling,
heating or cleaning activities and the rate at which the particles were removed by both deposition and
air exchange processes. At each of 25 schools in Brisbane, Australia, two weeks of measurements of PNC
and CO2 were taken both outdoors and in the two classrooms. Bayesian regression modelling was
employed in order to estimate the relevant rates and analyse the relationship between air exchange rate
(AER), particle infiltration and the deposition rates of particle generated from indoor activities in the
classrooms. During schooling hours, grilling events at the school tuckshop as well as heating and printing
in the classrooms led to indoor PNCs being elevated by a factor of more than four, with emission rates of
(2.51 0.25) 1011 p min1
, (8.99 6.70) 1011 p min1 and (5.17 2.00) 1011 p min1
, respectively.
During non-school hours, cleaning events elevated indoor PNC by a factor of above five, with an average
emission rate of (2.09 6.30) 1011 p min1
. Particles were removed by both air exchange and deposition;
chiefly by ventilation when AER > 0.7 h1 and by deposition when AER < 0.7 h1
.
Item Details
Item Type: | Refereed Article |
---|---|
Keywords: | ultrafine particles, deposition rates, schools |
Research Division: | Earth Sciences |
Research Group: | Atmospheric sciences |
Research Field: | Atmospheric aerosols |
Objective Division: | Environmental Management |
Objective Group: | Air quality, atmosphere and weather |
Objective Field: | Air quality |
UTAS Author: | Salimi, F (Dr Farhad Salimi) |
ID Code: | 105249 |
Year Published: | 2014 |
Web of Science® Times Cited: | 31 |
Deposited By: | Menzies Institute for Medical Research |
Deposited On: | 2015-12-16 |
Last Modified: | 2016-08-08 |
Downloads: | 0 |
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