2017
DOI: 10.1007/s11869-017-0473-0
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Redox characteristics of size-segregated PM from different public transport microenvironments in Hong Kong

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Cited by 18 publications
(15 citation statements)
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References 49 publications
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“…Finally, these analyses are only relevant for PM 10 when some health studies are now taking PM 2.5 into account. Additional studies addressing the comparison of OP results associated with PM 10 and PM 2.5 are needed (Gali et al, 2017;Styszko et al, 2017).…”
Section: Multiple Linear Regression Modelsmentioning
confidence: 99%
“…Finally, these analyses are only relevant for PM 10 when some health studies are now taking PM 2.5 into account. Additional studies addressing the comparison of OP results associated with PM 10 and PM 2.5 are needed (Gali et al, 2017;Styszko et al, 2017).…”
Section: Multiple Linear Regression Modelsmentioning
confidence: 99%
“…Studies have shown that the concentrations of particular matter (PM) 10 and PM2.5 in subway systems were ∌20-50% higher than those in the aboveground environment (38,39) and were affected by train running, crowd activity, season, and outdoor climate (38,(40)(41)(42). Atmospheric particles in subway systems contain high concentrations of metal compounds with the potential for oxidation, including manganese (Mn), chromium (Cr), titanium (Ti), iron (Fe), copper (Cu), zinc (Zn), nickel (Ni), and molybdenum (Mo), as well as organic compounds, such as polycyclic aromatic hydrocarbons (PAHs), which come from subway tracks, wheels, chain rings, brake pads, and pantographs (33,35,37,43,44). The elevated particles increased commuter exposure to them; for example, subway personal PM exposure increased by 3%, Fe exposure increased by nearly 200%, Mn exposure increased by 60%, and Cu exposure increased by 40% (45,46).…”
Section: Subway Systems and Oxidative Stressmentioning
confidence: 99%
“…Furthermore, the authors observed significantly increased oxidative stress in the lungs of C57BL/6 mice administered PM10 for 8 h (59). Gali et al (44) observed that intracellular ROS were positively correlated not only with transition metals in subway particles but also with organic and elemental carbon (OCEC) in the particles (r > 0.85). Moreover, coarse particles can induce intracellular ROS production more than fine particles.…”
Section: Subway Systems and Oxidative Stressmentioning
confidence: 99%
“…Similarly, Gali and colleagues investigated the redox characteristics of PM from personal samplers of passengers making journeys on above-ground and below-ground routes of the Hong Kong underground (including time on the train and waiting on the platform), and compared this with PM collected from journeys on an overground train route, bus, and ambient PM [69]. This study was unusual in that the underground concentration of coarse and fine PM was lower than found in above ground train routes, with the lower concentrations underground attributed to the use of platform-edge doors, while the underground PM samples were also less metal-rich than seen in other studies, for example the Fe concentration of PM 2.5 being ~ 0.2% by mass.…”
Section: Main Textmentioning
confidence: 99%