The effect of particle resuspension during walking activity to PM 10 mass and number concentrations in an indoor microenvironment

Serfozo, Norbert; Chatoutsidou, Sofia Eirini; Lazaridis, Mihalis

doi:10.1016/j.buildenv.2014.08.017

Cited by 53 publications

(24 citation statements)

References 67 publications

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“…Moreover, it is observed that I/O ratio for PM 10 is shifted to higher values 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64compared to number concentration data with average I/O ratio at 0.18 for PM 10 in office A, while, the highest I/O ratio for coarse particles was at 0.06 (1-2.5 and 2.5e18 mm). Several studies propose that human resuspension activities are associated with emissions at higher particle sizes (>PM 2.5 ) [3,22,32,35], which is in agreement with the presented results.…”

Section: I/o Ratiosupporting

confidence: 92%

“…5 denotes temporal increases of the outdoor concentration in the period 04 -06/06/14 similar to the ones observed indoors. Indeed, outdoor particles penetrate indoors and influence the indoor concentration [39,43], but it is likely that infiltration of outdoor particles is strongest for particle sizes between 0.1 and 0.5 mm [4,42,51,52], whereas, human activities that resuspend indoor particles influence mostly higher particle sizes [7,22,29,32,33].…”

Section: Office Amentioning

confidence: 99%

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Indoor/outdoor particulate matter number and mass concentration in modern offices

Chatoutsidou

Ondráček

Tesař

et al. 2015

Building and Environment

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a b s t r a c tIndoor/Outdoor (I/O) particulate mass concentration (PM 10 ) and number concentrations were measured online in modern office environments with mechanical ventilation. The measurement took place during June 2014 in a building, which, belongs to the Norwegian Institute for Air Research, in Norway. Particle number size distribution was measured with an SMPS (0.014e0.7 mm) and an APS (0.5e18 mm) instruments, whereas, mass concentration was measured with a Dust-Trak II photometer. Two offices were selected to examine the outdoor contribution of particles and the influence of indoor sources. One office was fully occupied during working hours and the second one unoccupied at all times. The results suggested that human presence during the working hours affected considerably indoor particles in the occupied office both in terms of number and mass concentration compared to the non-working hours conditions. In the absence of any significant indoor source generating new particles (hardcopy devices), the indoor environment was influenced mainly from the presence of people with resuspension activities being the most important source for particle sizes larger than 1 mm. Moreover, indoor particle number and mass concentration was influenced substantially from outdoor sources. Generally, both indoor number and mass concentrations showed temporal fluctuations similar to those observed outdoors, suggesting that particle penetration was significant in both offices. However, low I/O ratio (90 th percentile < 0.3 for both offices) indicated the efficient removal of particles from the air filtration system.

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Section: I/o Ratiosupporting

confidence: 92%

Section: Office Amentioning

confidence: 99%

Indoor/outdoor particulate matter number and mass concentration in modern offices

Chatoutsidou

Ondráček

Tesař

et al. 2015

Building and Environment

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“…3. The Pearson coefficient for the 2 years measurements is 0.76 which supports the hypothesis of the influence of visitors to the indoor PM 10 levels through particle resuspension [19] and the visitors' presence [13]. Similarly, the concentrations of the cultivable, airborne heterotrophic bacteria correlated well with the daily visitors numbers showing a Pearson coefficient for the 2 years measurements of 0.75, indicating their anthropogenic origin.…”

Section: Particulate Matter Concentrationsupporting

confidence: 74%

“…Furthermore, the lower PM 2.5 / PM 10 ratio at the Neophytos Doukas Library in Zagori shows the presence of coarse particles mainly from soil resuspension processes. The importance of particle resuspension on PM 10 mass concentration indoors has been studied before [19] concluding that human walking and wind flow can increase considerably the PM 10 mass concentration levels. The seasonal variation of the PM 10 /PM 2.5 ratio indoors for the three cultural heritage collections is shown in Table 1.…”

Section: Particulate Matter Concentrationmentioning

confidence: 99%

Indoor/outdoor particulate matter concentrations and microbial load in cultural heritage collections

et al. 2015

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Background: Particulate matter, microorganisms in air and environmental conditions present a potential risk to museum collections. There are also limited studies of simultaneous measurements of airborne particles and microorganisms inside museums and the effects of seasonal variations. Therefore, extensive indoor/outdoor measurements of particulate matter mass/number concentrations and viable, cultivable microbial load were performed in two museums and a library in Greece for a period of 2 years at selected time intervals. The culture heritage collections are located at coastal (Historical Museum of Crete in Heraklion), urban (Criminology Museum of the University of Athens) and mountainous (Neophytos Doukas Library in Zagori) environments and their collections consist mainly of organic materials. Measurements of inhalable particulate mass (PM 10 , PM 2.5 , PM 1) and viable, cultivable airborne microorganism concentrations (heterotrophic bacteria, cellulose metabolizing bacteria, acid producing bacteria and mesophilic fungi) in air were performed. Results and conclusions: The indoor PM 10 and microbial concentrations were higher than the outdoor levels showing the influence of the indoor sources, such as the presence of people and indoor activities, as well as, anthropogenic outdoor sources, and natural emissions. Elevated PM 1 particle number concentrations were also encountered in the Historical Museum of Crete in Heraklion and the Criminology Museum of the University of Athens due to the high anthropogenic emissions of the urban areas. The lowest concentrations of viable, cultivable airborne microorganisms were measured in the Historical Museum of Crete at the coastal site, which encounters also well controlled microclimatic conditions. In comparison to the other two naturally ventilated sites, the highest concentrations of viable, cultivable airborne fungi were measured in the Neophytos Doukas Library at the mountainous site, whereas the highest concentrations of viable, cultivable airborne heterotrophic bacteria were measured in the Criminology Museum of the University of Athens at an urban site, where mummified tissues and dry specimens are exhibited. The closed showcases of the two museums and the library could only protect the exhibits from viable, cultivable airborne fungi, but not from specific categories of bacteria. Acid producing bacteria in the Historical Museum of Crete, cellulose metabolizing bacteria in the Neophytos Doukas Library, and opportunistic pathogenic heterotrophic bacteria in the Criminology Museum of the University of Athens showed to be enriched inside the closed showcases.

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“…In many IAQ monitoring studies, the highest indoor aerosol concentrations occur during cooking or biomass burning events [6][7][8]. Vacuuming [9], dusting [10], and general occupant movement [11] can resuspend settled dust. Dust resuspension tends to emit more mass in the super-micron size range than the submicron range.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Variability of Airborne Particulate Matter and Bacterial Concentrations in Colorado Homes

et al. 2018

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Aerosol measurements were collected at fifteen homes over the course of one year in Colorado (USA) to understand the temporal variability of indoor air particulate matter and bacterial concentrations and their relationship with home characteristics, inhabitant activities, and outdoor air particulate matter (PM). Indoor and outdoor PM 2.5 concentrations averaged (±st. dev.) 8.1 ± 8.1 µg/m 3 and 6.8 ± 4.5 µg/m 3 , respectively. Indoor PM 2.5 was statistically significantly higher during summer compared to spring and winter; outdoor PM 2.5 was significantly higher for summer compared to spring and fall. The PM 2.5 I/O ratio was 1.6 ± 2.4 averaged across all homes and seasons and was not statistically significantly different across the seasons. Average indoor PM 10 was 15.4 ± 18.3 µg/m 3 and was significantly higher during summer compared to all other seasons. Total suspended particulate bacterial biomass, as determined by qPCR, revealed very little seasonal differences across and within the homes. The qPCR I/O ratio was statistically different across seasons, with the highest I/O ratio in the spring and lowest in the summer. Using one-minute indoor PM 10 data and activity logs, it was observed that elevated particulate concentrations commonly occurred when inhabitants were cooking and during periods with elevated outdoor concentrations.

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The effect of particle resuspension during walking activity to PM 10 mass and number concentrations in an indoor microenvironment

Cited by 53 publications

References 67 publications

Indoor/outdoor particulate matter number and mass concentration in modern offices

Indoor/outdoor particulate matter number and mass concentration in modern offices

Indoor/outdoor particulate matter concentrations and microbial load in cultural heritage collections

Seasonal Variability of Airborne Particulate Matter and Bacterial Concentrations in Colorado Homes

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