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The Effect of Sampling Inlet Direction and Distance on Particle Source Measurements for Dispersion Modelling

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The Effect of Sampling Inlet Direction and Distance on Particle Source Measurements for Dispersion Modelling. / Jensen, Alexander Christian Osterskov; Poikkimäki, Mikko; Brostrom, Anders; Dal Maso, Miikka; Nielsen, Ole John; Rosenorn, Thomas; Butcher, Andrew; Koponen, Ismo Kalevi; Koivisto, Antti Joonas.

In: Aerosol and Air Quality Research, Vol. 19, No. 5, 05.2019, p. 1114-1125.

Research output: Contribution to journalArticleScientificpeer-review

Harvard

Jensen, ACO, Poikkimäki, M, Brostrom, A, Dal Maso, M, Nielsen, OJ, Rosenorn, T, Butcher, A, Koponen, IK & Koivisto, AJ 2019, 'The Effect of Sampling Inlet Direction and Distance on Particle Source Measurements for Dispersion Modelling', Aerosol and Air Quality Research, vol. 19, no. 5, pp. 1114-1125. https://doi.org/10.4209/aaqr.2018.08.0322

APA

Jensen, A. C. O., Poikkimäki, M., Brostrom, A., Dal Maso, M., Nielsen, O. J., Rosenorn, T., ... Koivisto, A. J. (2019). The Effect of Sampling Inlet Direction and Distance on Particle Source Measurements for Dispersion Modelling. Aerosol and Air Quality Research, 19(5), 1114-1125. https://doi.org/10.4209/aaqr.2018.08.0322

Vancouver

Author

Jensen, Alexander Christian Osterskov ; Poikkimäki, Mikko ; Brostrom, Anders ; Dal Maso, Miikka ; Nielsen, Ole John ; Rosenorn, Thomas ; Butcher, Andrew ; Koponen, Ismo Kalevi ; Koivisto, Antti Joonas. / The Effect of Sampling Inlet Direction and Distance on Particle Source Measurements for Dispersion Modelling. In: Aerosol and Air Quality Research. 2019 ; Vol. 19, No. 5. pp. 1114-1125.

Bibtex - Download

@article{454fe1b4d67945b092ba372c8e3620c2,
title = "The Effect of Sampling Inlet Direction and Distance on Particle Source Measurements for Dispersion Modelling",
abstract = "The source rate is the single most critical input parameter in dispersion models. Determining accurate source rates from workplace processes can be challenging due to interference with work operation and poorly known dilution between the outlet of the particle generator and the measurement point. In this work, we measured the aerosol source rate in a chamber with a steady release of TiO2 particles generated by an aerosol brush generator. The number concentrations measured directly from the particle generator and in the source position near the source spanned three orders of magnitude depending on the relative location and orientation to the source. Moreover, a dispersion factor was calculated based on a single mode fit of the obtained source rates. The dispersion factor takes into account the dispersion and dilution occurring between the measurement point and the source outlet for subsequent modelling. The particle emission rates were implemented in a previously published multi-box aerosol dispersion model using a one-box layout. The modelled concentrations were compared with concentrations measured in three locations in the chamber. We found that using a dispersion factor of one, meaning that at-source dilution or dispersion was not accounted for, the modelled concentrations were 1 to 3 orders of magnitude lower than measured concentrations for all source rates except the source rates measured directly from the aerosol generator. When applying the calculated dispersion factor, thereby correcting the source rate for initial dilution and dispersion, the concentrations were within 0.5 to 2 times the measured concentrations suggesting the use of such a factor to correctly estimate the source rate, and hence the occupational exposure.",
keywords = "Source measurements, Dispersion modelling, Chamber studies, Aerosol dispersion, Occupational health, ULTRAFINE PARTICLES, AIRBORNE PARTICLES, PERSONAL EXPOSURE, WORKER EXPOSURE, AIR-POLLUTION, EMISSIONS, NANOPARTICLES, INSTRUMENTS, NUMBER",
author = "Jensen, {Alexander Christian Osterskov} and Mikko Poikkim{\"a}ki and Anders Brostrom and {Dal Maso}, Miikka and Nielsen, {Ole John} and Thomas Rosenorn and Andrew Butcher and Koponen, {Ismo Kalevi} and Koivisto, {Antti Joonas}",
note = "EXT={"}Koivisto, Antti Joonas{"}",
year = "2019",
month = "5",
doi = "10.4209/aaqr.2018.08.0322",
language = "English",
volume = "19",
pages = "1114--1125",
journal = "Aerosol and Air Quality Research",
issn = "1680-8584",
publisher = "TAIWAN ASSOC AEROSOL RES-TAAR",
number = "5",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - The Effect of Sampling Inlet Direction and Distance on Particle Source Measurements for Dispersion Modelling

AU - Jensen, Alexander Christian Osterskov

AU - Poikkimäki, Mikko

AU - Brostrom, Anders

AU - Dal Maso, Miikka

AU - Nielsen, Ole John

AU - Rosenorn, Thomas

AU - Butcher, Andrew

AU - Koponen, Ismo Kalevi

AU - Koivisto, Antti Joonas

N1 - EXT="Koivisto, Antti Joonas"

PY - 2019/5

Y1 - 2019/5

N2 - The source rate is the single most critical input parameter in dispersion models. Determining accurate source rates from workplace processes can be challenging due to interference with work operation and poorly known dilution between the outlet of the particle generator and the measurement point. In this work, we measured the aerosol source rate in a chamber with a steady release of TiO2 particles generated by an aerosol brush generator. The number concentrations measured directly from the particle generator and in the source position near the source spanned three orders of magnitude depending on the relative location and orientation to the source. Moreover, a dispersion factor was calculated based on a single mode fit of the obtained source rates. The dispersion factor takes into account the dispersion and dilution occurring between the measurement point and the source outlet for subsequent modelling. The particle emission rates were implemented in a previously published multi-box aerosol dispersion model using a one-box layout. The modelled concentrations were compared with concentrations measured in three locations in the chamber. We found that using a dispersion factor of one, meaning that at-source dilution or dispersion was not accounted for, the modelled concentrations were 1 to 3 orders of magnitude lower than measured concentrations for all source rates except the source rates measured directly from the aerosol generator. When applying the calculated dispersion factor, thereby correcting the source rate for initial dilution and dispersion, the concentrations were within 0.5 to 2 times the measured concentrations suggesting the use of such a factor to correctly estimate the source rate, and hence the occupational exposure.

AB - The source rate is the single most critical input parameter in dispersion models. Determining accurate source rates from workplace processes can be challenging due to interference with work operation and poorly known dilution between the outlet of the particle generator and the measurement point. In this work, we measured the aerosol source rate in a chamber with a steady release of TiO2 particles generated by an aerosol brush generator. The number concentrations measured directly from the particle generator and in the source position near the source spanned three orders of magnitude depending on the relative location and orientation to the source. Moreover, a dispersion factor was calculated based on a single mode fit of the obtained source rates. The dispersion factor takes into account the dispersion and dilution occurring between the measurement point and the source outlet for subsequent modelling. The particle emission rates were implemented in a previously published multi-box aerosol dispersion model using a one-box layout. The modelled concentrations were compared with concentrations measured in three locations in the chamber. We found that using a dispersion factor of one, meaning that at-source dilution or dispersion was not accounted for, the modelled concentrations were 1 to 3 orders of magnitude lower than measured concentrations for all source rates except the source rates measured directly from the aerosol generator. When applying the calculated dispersion factor, thereby correcting the source rate for initial dilution and dispersion, the concentrations were within 0.5 to 2 times the measured concentrations suggesting the use of such a factor to correctly estimate the source rate, and hence the occupational exposure.

KW - Source measurements

KW - Dispersion modelling

KW - Chamber studies

KW - Aerosol dispersion

KW - Occupational health

KW - ULTRAFINE PARTICLES

KW - AIRBORNE PARTICLES

KW - PERSONAL EXPOSURE

KW - WORKER EXPOSURE

KW - AIR-POLLUTION

KW - EMISSIONS

KW - NANOPARTICLES

KW - INSTRUMENTS

KW - NUMBER

U2 - 10.4209/aaqr.2018.08.0322

DO - 10.4209/aaqr.2018.08.0322

M3 - Article

VL - 19

SP - 1114

EP - 1125

JO - Aerosol and Air Quality Research

JF - Aerosol and Air Quality Research

SN - 1680-8584

IS - 5

ER -