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The relationship between indoor and outdoor airborne particles in the residential environment

Morawska, Lidia, He, Congrong, Hitchins, Jane, Gilbert, Dale, & Parappukkaran, Sandhya (2001) The relationship between indoor and outdoor airborne particles in the residential environment. Atmospheric Environment, 35(20), pp. 3463-3473.

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Abstract

The relationship between indoor and outdoor airborne particles was investigated for 16 residential houses located in a suburban area of Brisbane, Australia. The submicrometer particle numbers were measured using the Scanning Mobility Particle Sizer, the larger particle numbers using the Aerodynamic Particle Sizer and an approximation of PM2.5 was also measured using a DustTrak. The measurements were conducted for normal and minimum ventilation conditions using simultaneous and non-simultaneous measurement methods designed for the purpose of the study. Comparison of the ratios of indoor to outdoor particle concentrations revealed that while temporary values of the ratio vary in a broad range from 0.2 to 2.5 for both lower and higher ventilation conditions, average values of the ratios were very close to one regardless of ventilation conditions and of particle size range. The ratios were in the range from 0.78 to 1.07 for submicrometer particles, from 0.95 to 1.0 for supermicrometer particles and from 1.01 to 1.08 for PM2.5 fraction. Comparison of the time series of indoor to outdoor particle concentrations shows a clear positive relationship existing for many houses under normal ventilation conditions (estimated to be about and above 2 h−1), but not under minimum ventilation conditions (estimated to be about and below 1 h−1). These results suggest that for normal ventilation conditions, outdoor particle concentrations could be used to predict instantaneous indoor particle concentrations but not for minimum ventilation, unless air exchange rate is known, thus allowing for estimation of the "delay constant".

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ID Code: 9689
Item Type: Journal Article
Keywords: Air pollution, Indoor air quality, Submicrometer particle, Supermicrometer particles
DOI: 10.1016/S1352-2310(01)00097-8
ISSN: 1352-2310
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2001 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 24 Sep 2007
Last Modified: 09 Jun 2010 22:46

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