Performance of ventilation filtration technologies on characteristic traffic related aerosol down to nanocluster size

Panu Karjalainen, Sampo Saari, Heino Kuuluvainen, Tapio Kalliohaka, Aimo Taipale, Topi Rönkkö

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

Near traffic routes and urban areas, the outdoor air particle number concentration is typically dominated by ultrafine particles. These particles can enter into the nearby buildings affecting the human exposure on ultrafine particles indoors. In this study, we demonstrate an aerosol generation system which mimics the characteristic traffic related aerosol. The aerosol generation system was used to determine the size-resolved particle filtration efficiencies of five typical commercial filters in the particle diameter range of 1.3-240 nm. Two different HEPA filters were observed to be efficient in all particle sizes. A fibrous filter (F7) was efficient at small particle sizes representing the nucleation mode of traffic related aerosol, but its efficiency decreased down to 60% with the increasing particle size. In contrast, the filtration efficiency of an electrostatic precipitator (ESP) increased as a function of the particle size, being more efficient for the soot mode of traffic related aerosol than for the nucleation mode. An electret filter with a charger was relatively efficient (filtration efficiency >85%) at all the observed particle sizes. The HEPA, F7 and electret filters were found to practically remove the particles/nanoclusters smaller than 3 nm. All in all, the filtration efficiencies were observed to be strongly dependent on the particle size and significant differences were found between different filters. Based on these results, we suggest that the particulate filter test standards should be extended to cover the ultrafine particles, which dominate the particle concentrations in outdoor air and are hazardous for public health.
Original languageEnglish
Pages (from-to)1398-1408
Number of pages11
JournalAerosol Science and Technology
Volume51
Issue number12
DOIs
Publication statusPublished - 2 Dec 2017
MoE publication typeA1 Journal article-refereed

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Nanoclusters
Aerosols
Ventilation
ventilation
Particle size
aerosol
particle size
filter
Electrets
nucleation
Nucleation
Soot
Electrostatic precipitators
Public health
Air
particle
traffic
air
soot
public health

Cite this

Karjalainen, Panu ; Saari, Sampo ; Kuuluvainen, Heino ; Kalliohaka, Tapio ; Taipale, Aimo ; Rönkkö, Topi. / Performance of ventilation filtration technologies on characteristic traffic related aerosol down to nanocluster size. In: Aerosol Science and Technology. 2017 ; Vol. 51, No. 12. pp. 1398-1408.
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abstract = "Near traffic routes and urban areas, the outdoor air particle number concentration is typically dominated by ultrafine particles. These particles can enter into the nearby buildings affecting the human exposure on ultrafine particles indoors. In this study, we demonstrate an aerosol generation system which mimics the characteristic traffic related aerosol. The aerosol generation system was used to determine the size-resolved particle filtration efficiencies of five typical commercial filters in the particle diameter range of 1.3-240 nm. Two different HEPA filters were observed to be efficient in all particle sizes. A fibrous filter (F7) was efficient at small particle sizes representing the nucleation mode of traffic related aerosol, but its efficiency decreased down to 60{\%} with the increasing particle size. In contrast, the filtration efficiency of an electrostatic precipitator (ESP) increased as a function of the particle size, being more efficient for the soot mode of traffic related aerosol than for the nucleation mode. An electret filter with a charger was relatively efficient (filtration efficiency >85{\%}) at all the observed particle sizes. The HEPA, F7 and electret filters were found to practically remove the particles/nanoclusters smaller than 3 nm. All in all, the filtration efficiencies were observed to be strongly dependent on the particle size and significant differences were found between different filters. Based on these results, we suggest that the particulate filter test standards should be extended to cover the ultrafine particles, which dominate the particle concentrations in outdoor air and are hazardous for public health.",
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Performance of ventilation filtration technologies on characteristic traffic related aerosol down to nanocluster size. / Karjalainen, Panu; Saari, Sampo; Kuuluvainen, Heino; Kalliohaka, Tapio; Taipale, Aimo; Rönkkö, Topi.

In: Aerosol Science and Technology, Vol. 51, No. 12, 02.12.2017, p. 1398-1408.

Research output: Contribution to journalArticleScientificpeer-review

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