Manganese concentrations in the air of the Montreal (Canada) subway in relation to surface automobile traffic density

Boudia, Nacéra; Halley, Renée; Kennedy, G.; Lambert, Jean; Gareau, Lise; Zayed, Joseph

doi:10.1016/j.scitotenv.2005.09.094

Cited by 59 publications

(27 citation statements)

References 15 publications

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“…Due to the structural limitations of the measuring instrument that was used in this research, it was not possible to collect air samples during rush hour. When considering that bacteria and fungi are dispersed into the air from subway passengers' clothes and hairs 10) , further research during the rush hour may clarify the subway passengers' actual exposure level to airborne bacteria and fungi. Since indoor airborne bacteria and fungi flow indoors from the outside via air flow from the ventilation 33) , and this research was conducted in the winter when the outdoor concentration is at its lowest of the four seasons 34) , this research may underestimate the exposure level of subway passengers.…”

Section: Concentration Distribution Of Airborne Bacteria and Fungi Inmentioning

confidence: 99%

“…In other foreign cities that have a subway system, field assessments of the subway stations' pollution have been focused on assessing the concentrations and characteristics of gaseous and particulate aerial pollutants [1][2][3][4][5][6][7][8][9][10][11] . There is, however, relatively little information related to biological contaminants' distribution characteristics in subway stations 12,13) .…”

Section: Introductionmentioning

confidence: 99%

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Exposure Level and Distribution Characteristics of Airborne Bacteria and Fungi in Seoul Metropolitan Subway Stations

Kim

et al. 2011

Ind Health

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Abstract:The exposure level and distribution characteristics of airborne bacteria and fungi were assessed in the workers' activity areas (station office, bedroom, ticket office and driver's seat) and passengers' activity areas (station precinct, inside the passenger carriage, and platform) of the Seoul metropolitan subway. Among investigated areas, the levels of airborne bacteria and fungi in the workers' bedroom and station precincts were relatively high. No significant difference was found in the concentration of airborne bacteria and fungi between the underground and above ground activity areas of the subway. The genera identified in all subway activity areas with a 5% or greater detection rate were Staphylococcus, Micrococcus, Bacillus and Corynebacterium for airborne bacteria and Penicillium, Cladosporium, Chrysosporium, Aspergillus for airborne fungi. Staphylococcus and Micrococcus comprised over 50% of the total airborne bacteria and Penicillium and Cladosporium comprised over 60% of the total airborne fungi, thus these four genera are the predominant genera in the subway station.

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Section: Concentration Distribution Of Airborne Bacteria and Fungi Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exposure Level and Distribution Characteristics of Airborne Bacteria and Fungi in Seoul Metropolitan Subway Stations

Kim

et al. 2011

Ind Health

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“…48 Similarly, increased levels of these metals in subway systems have been reported in other studies as well and are a concern because of the health risks associated with excessive exposure. 49,50 Although research in this area is growing, clearly more work is needed, especially given the large number of potentially exposed individuals.…”

Section: Miscellaneous Health and Safety Hazards Associated With Subwaysmentioning

confidence: 99%

Health and Safety Hazards Associated with Subways: A Review

Gershon

2005

Journal of Urban Health: Bulletin of the New York Academy of Me

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“…Previous attempts to assess the environmental conditions in the subway system have focused on the concentration and chemical composition of PM, with contradictory results (Aarnio et al, 2005;Boudia et al, 2006;Chillrud et al, 2004;Guo et al, 2014;Karlsson et al, 2005;Lu et al, 2015;Salma et al, 2007;Gómez-Perales et al, 2007;Querol et al, 2012) attributed to the different designs of the subway systems (Nieuwenhuijsen et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Granulometric and magnetic properties of deposited particles in the Beijing subway and the implications for air quality management

Cui

Zhou

Dearing

2016

Science of The Total Environment

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The subway system is an important traffic facility in Beijing and its internal air quality is an environmental issue that could potentially affect millions of people every day. Due to the intrinsic nature of rail abrasion in subway tunnels, iron-containing particles can be generated and become suspended in the subway environment. While some studies (e.g. Li et al., 2006) have monitored the in-train levels of PM2.5s (particles < 2.5 μm), there is a lack of systematic assessment of the concentration and characteristics of iron-containing particles in the Beijing subway system. Here we report results of a study on the granulometric and magnetic properties of particulate samples collected at different localities of the Beijing subway system. Our results show that the subway samples are characterized by the presence of very fine particles. Volume proportions of 6.1 ± 1.3 % for PM2.5s and 27.5 ± 6.1 % for PM10s (particles < 10 μm) are found in the bulk subway particulate samples. These samples exhibit a strong magnetic signal, which is approximately two orders of magnitude higher than that in naturally deposited particles collected in Beijing. Fine grained ferromagnetic and ferrimagnetic minerals (e.g. iron and magnetite, respectively) are identified from mineral magnetic measurements and scanning electric microscopy. The samples collected from the Beijing stations with platform screen doors are found to be magnetically stronger and finer than those without them, suggesting that platform screen doors have failed to block the fine iron-containing particulate matters released from the rail tunnel. Given the potential health consequences of fine suspended ironcontaining particles, our results have important implications for air quality management in the Beijing subway system. We here submit a manuscript entitled "Granulometric and magnetic properties of particulate matter in the Beijing subway and the implications for air quality management". This work reports our finding of very fine particle matters in the Beijing subway environment, which are characterized by distinctly strong magnetic signals compared to those in naturally deposited particles. We also found variation of magnetic PM in the subway environment with platform screen door designs.Considering the potential health consequences of fine suspended iron-containing particles identified with magnetic techniques, our results not only have important implications for air quality management in the Beijing subway system but also demonstrate a new way of assessing environmental quality in metropolitan cities with subways.Thank you for your consideration. 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 64 65 2 ABSTRACT The subway system is an important traffic facility in Beijing and its internal air quality is an environmental issue that could potentially affect mill...

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Manganese concentrations in the air of the Montreal (Canada) subway in relation to surface automobile traffic density

Cited by 59 publications

References 15 publications

Exposure Level and Distribution Characteristics of Airborne Bacteria and Fungi in Seoul Metropolitan Subway Stations

Exposure Level and Distribution Characteristics of Airborne Bacteria and Fungi in Seoul Metropolitan Subway Stations

Health and Safety Hazards Associated with Subways: A Review

Granulometric and magnetic properties of deposited particles in the Beijing subway and the implications for air quality management

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