Ultrafine Particles: Exposure and Source Apportionment in 56 Danish Homes
Bekö, Gabriel ; Weschler, Charles J. ; Wierzbicka, Aneta LU
; Karotki, Dorina Gabriela
; Toftum, Jørn
; Loft, Steffen
and Clausen, Geo
(2013)
In Environmental Science & Technology
47(18).
p.10240-10248
- Abstract
- ABSTRACT: Particle number (PN) concentrations (10−300 nm in
size) were continuously measured over a period of ∼45 h in 56
residences of nonsmokers in Copenhagen, Denmark. The highest
concentrations were measured when occupants were present and
awake (geometric mean, GM: 22.3 × 103 cm−3), the lowest when the
homes were vacant (GM: 6.1 × 103 cm−3) or the occupants were
asleep (GM: 5.1 × 103 cm−3). Diary entries regarding occupancy and
particle related activities were used to identify source events and
apportion the daily integrated exposure among sources. Source
events clearly resulted in increased PN concentrations and decreased
average particle... (More) - ABSTRACT: Particle number (PN) concentrations (10−300 nm in
size) were continuously measured over a period of ∼45 h in 56
residences of nonsmokers in Copenhagen, Denmark. The highest
concentrations were measured when occupants were present and
awake (geometric mean, GM: 22.3 × 103 cm−3), the lowest when the
homes were vacant (GM: 6.1 × 103 cm−3) or the occupants were
asleep (GM: 5.1 × 103 cm−3). Diary entries regarding occupancy and
particle related activities were used to identify source events and
apportion the daily integrated exposure among sources. Source
events clearly resulted in increased PN concentrations and decreased
average particle diameter. For a given event, elevated particle
concentrations persisted for several hours after the emission of fresh
particles ceased. The residential daily integrated PN exposure in the
56 homes ranged between 37 × 103 and 6.0 × 106 particles per cm3·h/day (GM: 3.3 × 105 cm−3·h/day). On average, ∼90% of
this exposure occurred outside of the period from midnight to 6 a.m. Source events, especially candle burning, cooking, toasting,
and unknown activities, were responsible on average for ∼65% of the residential integrated exposure (51% without the unknown
activities). Candle burning occurred in half of the homes where, on average, it was responsible for almost 60% of the integrated
exposure. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4293194
- author
- Bekö, Gabriel
; Weschler, Charles J.
; Wierzbicka, Aneta
LU
; Karotki, Dorina Gabriela
; Toftum, Jørn
; Loft, Steffen
and Clausen, Geo
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Environmental Science & Technology
- volume
- 47
- issue
- 18
- pages
- 10240 - 10248
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000330096000023
- scopus:84884227920
- pmid:23957328
- ISSN
- 1520-5851
- DOI
- 10.1021/es402429h
- language
- English
- LU publication?
- yes
- id
- 3104cd44-6fdc-4b26-ab25-a3316909470f (old id 4293194)
- alternative location
- http://pubs.acs.org/doi/abs/10.1021/es402429h
- date added to LUP
- 2016-04-01 14:07:51
- date last changed
- 2022-04-06 08:51:37
@article{3104cd44-6fdc-4b26-ab25-a3316909470f,
abstract = {{ABSTRACT: Particle number (PN) concentrations (10−300 nm in<br/><br>
size) were continuously measured over a period of ∼45 h in 56<br/><br>
residences of nonsmokers in Copenhagen, Denmark. The highest<br/><br>
concentrations were measured when occupants were present and<br/><br>
awake (geometric mean, GM: 22.3 × 103 cm−3), the lowest when the<br/><br>
homes were vacant (GM: 6.1 × 103 cm−3) or the occupants were<br/><br>
asleep (GM: 5.1 × 103 cm−3). Diary entries regarding occupancy and<br/><br>
particle related activities were used to identify source events and<br/><br>
apportion the daily integrated exposure among sources. Source<br/><br>
events clearly resulted in increased PN concentrations and decreased<br/><br>
average particle diameter. For a given event, elevated particle<br/><br>
concentrations persisted for several hours after the emission of fresh<br/><br>
particles ceased. The residential daily integrated PN exposure in the<br/><br>
56 homes ranged between 37 × 103 and 6.0 × 106 particles per cm3·h/day (GM: 3.3 × 105 cm−3·h/day). On average, ∼90% of<br/><br>
this exposure occurred outside of the period from midnight to 6 a.m. Source events, especially candle burning, cooking, toasting,<br/><br>
and unknown activities, were responsible on average for ∼65% of the residential integrated exposure (51% without the unknown<br/><br>
activities). Candle burning occurred in half of the homes where, on average, it was responsible for almost 60% of the integrated<br/><br>
exposure.}},
author = {{Bekö, Gabriel and Weschler, Charles J. and Wierzbicka, Aneta and Karotki, Dorina Gabriela and Toftum, Jørn and Loft, Steffen and Clausen, Geo}},
issn = {{1520-5851}},
language = {{eng}},
number = {{18}},
pages = {{10240--10248}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Environmental Science & Technology}},
title = {{Ultrafine Particles: Exposure and Source Apportionment in 56 Danish Homes}},
url = {{http://dx.doi.org/10.1021/es402429h}},
doi = {{10.1021/es402429h}},
volume = {{47}},
year = {{2013}},
}