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Recent progress in research on PM2.5 in subways.

Li Chang1, Wen Tong Chong1, Xinru Wang2

  • 1Department of Mechanical Engineering, Faculty of Engineering, Universiti Malaya, Kuala Lumpur, 50603, Malaysia. s2001637@siswa.um.edu.my chong_wentong@um.edu.my.

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This review synthesizes research on subway particulate matter (PM2.5), highlighting its health risks and the need for better control strategies. Understanding PM2.5 sources and impacts is crucial for improving indoor air quality in transit systems.

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Area of Science:

  • Environmental Science
  • Public Health
  • Urban Planning

Background:

  • Particulate matter (PM2.5) significantly impacts indoor air quality in subway systems.
  • The small size and large surface area of PM2.5 allow it to carry toxic substances, posing health risks to passengers and staff.

Purpose of the Study:

  • To provide a comprehensive review of nearly twenty years of research on PM2.5 in subway stations.
  • To consolidate information on concentration levels, influencing factors, physicochemical properties, sources, health impacts, and mitigation measures.

Main Methods:

  • Systematic literature review of over 130 published studies on subway PM2.5.
  • Analysis of research concerning PM2.5 concentration, properties, origins, health effects, and control strategies.

Main Results:

  • Key determinants of PM2.5 concentration (season, outdoor environment, station depth) have been identified, but their relative influence remains uncertain.
  • Subway PM2.5 originates from both external (traffic) and internal (braking, rails) sources, with source proportions unknown.
  • Current control strategies like ventilation and filtration are often inefficient for PM2.5 removal.

Conclusions:

  • The relative influence of PM2.5 determinants and the exact proportion of different sources require further investigation.
  • The health impacts of subway PM2.5 exposure are not well understood.
  • Future research should prioritize long-term data collection, source apportionment, health impact mechanisms, and the establishment of specific PM2.5 standards for subways.