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Whole-Body Nanoparticle Aerosol Inhalation Exposures
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Aerosol sources in subway environments.

M C Minguillón1, C Reche1, V Martins1

  • 1Institute of Environmental Assessment and Water Research (IDAEA), CSIC, Barcelona, Spain.

Environmental Research
|August 10, 2018
PubMed
Summary

Millions use subways despite high particulate matter (PM). This study identified key aerosol sources in Barcelona

Keywords:
AerosolsAir qualityMetroParticulate matterSource apportionment

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Public Health

Background:

  • Subway environments have high particulate matter (PM) concentrations.
  • Understanding aerosol sources is crucial for improving air quality in public transport.
  • Millions globally rely on rail subway systems daily.

Purpose of the Study:

  • To identify and quantify aerosol source contributions in the Barcelona metro system.
  • To analyze the chemical composition of PM2.5 and subway components.
  • To assess the impact of station type and operational activity on air quality.

Main Methods:

  • Conducted an aerosol monitoring campaign in 11 Barcelona subway stations.
  • Collected and chemically analyzed PM2.5 samples for elements, ions, and carbon.
  • Determined the chemical composition of subway components (brakes, rails, pantographs).
  • Applied receptor modeling (Positive Matrix Factorization) to identify emission sources.

Main Results:

  • Mean PM2.5 concentrations ranged from 26 to 86 µg/m³.
  • Subway PM2.5 was dominated by Fe2O3 and carbonaceous matter.
  • Newer stations with Platform Screen Doors (PSD) showed lower PM2.5 concentrations.
  • Ten sources were identified, including five subway-specific ones (e.g., RailWheel, Brake).
  • Subway sources contributed significantly (21-91%) to bulk PM2.5.
  • Weekend activity reduced subway-specific source contributions.
  • Health-related elements were primarily attributed to subway sources (>60%).

Conclusions:

  • Aerosol composition and source contributions vary significantly across subway stations and lines.
  • Platform Screen Doors (PSD) can reduce PM2.5 concentrations.
  • Receptor modeling successfully identified key subway-specific emission sources.
  • Reducing subway activity, especially on weekends, lowers PM2.5 and associated source contributions.
  • Subway-specific sources are major contributors to health-related elements in subway air.