Evaluation of particulate matter concentration in Shanghai’s metro system and strategy for improvement

The air quality in Shanghai’s subway system has become a big concern. At present, the system is the longest in the world, and its daily passenger volume exceeds 9 × 106 travelers every work day. In this study, the authors comprehensively assessed the fine particulate matter (PM₂.₅) concentrations in the 14 lines of Shanghai’s metro system through field measurements in the metro (subway) system and real-time data acquisition at the nearest state-run air sampling sites. The authors ranked and clustered the 14 lines according to the PM₂.₅ concentrations and the relative concentrations in the halls and on the platform of the metro station and inside the train for each line. The authors identified the factors that influence the PM₂.₅ concentration, and found that the external environment appears to have the strongest influence on air quality. In addition, the age of the line, type of platform (screen door versus half-height security door), air-conditioning filtration system, and other factors influenced the PM₂.₅ concentration for each line. Based on the authors' evaluation of the contamination and its causes, the authors propose potential solutions, such as reducing particulate matter invasion from pollution sources, updating the environmental protection hardware (i.e., filtration systems), developing a more scientific cleaning program, and optimizing the travel behavior of passengers and working conditions of merchants to improve the air quality and reduce traveler exposure to pollution in the metro system.


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  • Accession Number: 01639293
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 27 2017 4:10PM