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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:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Environmental Science & Technology
volume
47
issue
18
pages
10240 - 10248
publisher
The American Chemical Society
external identifiers
  • wos:000330096000023
  • scopus:84884227920
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
2014-02-12 09:27:52
date last changed
2019-08-14 02:23:47
@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},
  series       = {Environmental Science & Technology},
  title        = {Ultrafine Particles: Exposure and Source Apportionment in 56 Danish Homes},
  url          = {http://dx.doi.org/10.1021/es402429h},
  volume       = {47},
  year         = {2013},
}