Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/174781
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Title

Atmospheric Environment

AuthorsMoreno, Teresa CSIC ORCID ; Kelly, Frank J.; Dunster, Christina A.; Oliete, Ana; Martins, Vânia ORCID; Reche, Cristina CSIC ORCID; Minguillón, María Cruz CSIC ORCID ; Amato, Fulvio CSIC ORCID ; Capdevila, Marta; De Miguel, Eladio; Querol, Xavier CSIC ORCID
KeywordsAirborne metals
Oxidative potential
Particulate matter
PM chemistry
Subway air quality
Toxicity
Issue Date1-Jan-2017
PublisherElsevier
CitationAtmospheric Environment 148: 230-238 (2017)
AbstractAir quality in subway systems is of interest not only because particulate matter (PM) concentrations can be high, but also because of the peculiarly metalliferous chemical character of the particles, most of which differ radically from those of outdoor ambient air. We report on the oxidative potential (OP) of PM2.5 samples collected in the Barcelona subway system in different types of stations. The PM chemical composition of these samples showed typically high concentrations of Fe, Total Carbon, Ba, Cu, Mn, Zn and Cr sourced from rail tracks, wheels, catenaries, brake pads and pantographs. Two toxicological indicators of oxidative activity, ascorbic acid (AA) oxidation (expressed as OPAA μg−1 or OPAA m−3) and glutathione (GSH) oxidation (expressed as OPGSH μg−1 or OPGSH m−3), showed low OP for all samples (compared with outdoor air) but considerable variation between stations (0.9–2.4 OPAA μg−1; 0.4–1.9 OPGSH μg−1). Results indicate that subway PM toxicity is not related to variations in PM2.5 concentrations produced by ventilation changes, tunnel works, or station design, but may be affected more by the presence of metallic trace elements such as Cu and Sb sourced from brakes and pantographs. The OP assays employed do not reveal toxic effects from the highly ferruginous component present in subway dust. © 2016 The Authors
Publisher version (URL)https://doi.org/10.1016/j.atmosenv.2016.10.045
URIhttp://hdl.handle.net/10261/174781
DOI10.1016/j.atmosenv.2016.10.045
Appears in Collections:(IDAEA) Artículos

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