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| Titel |
Vertical particle concentration profiles around urban office buildings |
| VerfasserIn |
T. N. Quang, C. He, L. Morawska, L. D. Knibbs, M. Falk |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 11 ; Nr. 12, no. 11 (2012-06-07), S.5017-5030 |
| Datensatznummer |
250011226
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| Publikation (Nr.) |
 copernicus.org/acp-12-5017-2012.pdf |
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| Zusammenfassung |
Despite its role in determining both indoor and outdoor human exposure to
anthropogenic particles, there is limited information describing vertical
profiles of particle concentrations in urban environments, especially for
ultrafine particles. Furthermore, the results of the few studies performed
have been inconsistent. As such, this study aimed to assess the influence of
vehicle emissions and nucleation formation on particle characteristics
(particle number size distribution – PNSD and PM2.5 concentration) at
different heights around three urban office buildings located next to busy
roads in Brisbane, Australia, and place these results in the broader context
of the existing literature. Two sets of instruments were used to
simultaneously measure PNSD, particle number (PN) and PM2.5
concentrations, respectively, for up to three weeks at each building.
The results showed that both PNSD and PM2.5 concentration around
building envelopes were influenced by vehicle emissions and new particle
formation, and that they exhibited variability across the three different
office buildings. During nucleation events, PN concentration in size range
of <30 nm and total PN concentration increased (7–65% and 5–46%,
respectively), while PM2.5 concentration decreased (36–52%) with height.
This study has shown an under acknowledged role for nucleation in producing
particles that can affect large numbers of people, due to the high density
and occupancy of urban office buildings and the fact that the vast majority
of people's time is spent indoors. These findings highlight important new
information related to the previously overlooked role of particle formation
in the urban atmosphere and its potential effects on selection of air intake
locations and appropriate filter types when designing or upgrading
mechanical ventilation systems in urban office buildings. The results also
serve to better define particle behaviour and variability around building
envelopes, which has implications for studies of both human exposure and
particle dynamics. |
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