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Assessing the contributions of outdoor and indoor sources to air quality in London homes of the SCAMP cohort

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Title: Assessing the contributions of outdoor and indoor sources to air quality in London homes of the SCAMP cohort
Authors: Vu, TV
Stewart, GB
Kitwiroon, N
Lim, S
Barratt, B
Kelly, FJ
Thompson, R
Smith, RB
Toledano, MB
Beevers, SD
Item Type: Journal Article
Abstract: Given that many people typically spend the majority of their time at home, accurate measurement and modelling of the home environment is critical in estimating their exposure to air pollution. This study investigates the fate and impact on human exposure of outdoor and indoor pollutants in London homes, using a combination of sensor measurements, outdoor air pollution estimated from the CMAQ-urban model and indoor mass balance models. Averaged indoor concentrations of PM2.5, PM10 and NO2 were 14.6, 24.7 and 14.2 μg m−3 while the outdoor concentrations were 14.4, 22.6 and 21.4 μg m−3, respectively. Mean infiltration factors of particles (0.6–0.7) were higher than those of NO2 (0.4). In contrast, higher loss rates were found for NO2 (0.5–0.8 h−1) compared to those for particles (0.1–0.3 h−1). The average concentrations of PM2.5, PM10 and NO2 in kitchen environments were 22.0, 33.7 and 20.8 μg m−3, with highest hourly concentrations (437, 644 and 136 μg m−3, respectively) during cooking times (6–7 pm). Indoor sources increased the indoor concentrations of particles and NO2 by an average of 26–37% in comparison to the indoor background level without indoor sources. Outdoor and indoor air exchange plays an important role in reducing air pollution indoors by 65–86% for particles and 42–65% for NO2.
Issue Date: 15-Aug-2022
Date of Acceptance: 30-Jun-2022
URI: http://hdl.handle.net/10044/1/98284
DOI: 10.1016/j.buildenv.2022.109359
ISSN: 0360-1323
Publisher: Elsevier BV
Start Page: 1
End Page: 8
Journal / Book Title: Building and Environment
Volume: 222
Copyright Statement: © 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Sponsor/Funder: Medical Research Council (MRC)
National Institute for Health Research
Funder's Grant Number: MR/R00322X/1
Keywords: Building & Construction
0502 Environmental Science and Management
1201 Architecture
1202 Building
Publication Status: Published
Article Number: 109359
Online Publication Date: 2022-07-09
Appears in Collections:Faculty of Medicine
School of Public Health

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