HighlightsQuantitative investigation on PM2.5 and CO2 exposure level in the subway carriages.3 key factors can significantly affect the in-carriage PM2.5 concentration.In-carriage PM2.5 concentration is linearly proportional to the loaded passenger number.In-carriage PM2.5 concentration is significantly affected by the driving locations.In-carriage PM2.5 concentration inside old metro carriage is much larger than new ones.
AbstractAir quality inside transportation carriages has become a public concern. A comprehensive measurement campaign was conducted to examine the commuters’ exposure to PM2.5 (dp⩽2.5μm) and CO2 in Shanghai metro system under different conditions. The PM2.5 and CO2 concentrations inside all the measured metro lines were observed at 84±42μg/m3 and 1253.1±449.1ppm, respectively. The factors that determine the in-carriage PM2.5 and CO2 concentrations were quantitatively investigated. The metro in-carriage PM2.5 concentrations were significantly affected by the ventilation systems, out-carriage PM2.5 concentrations and the passenger numbers. The largest in-carriage PM2.5 and CO2 concentrations were observed at 132μg/m3 and 1855.0ppm inside the carriages equipped with the oldest ventilation systems. The average PM2.5 and CO2 concentrations increased by 24.14% and 9.93% as the metro was driven from underground to overground. The average in-carriage PM2.5 concentrations increased by 17.19% and CO2 concentration decreased by 16.97% as the metro was driven from urban to the suburban area. It was found that PM2.5 concentration is proportional to the on-board passenger number at a ratio of 0.4μg/m3·passenger. A mass-balance model was developed to estimate the in-carriage PM2.5 concentration under different driving conditions.
Commuters’ exposure to PM2.5 and CO2 in metro carriages of Shanghai metro system
Transportation Research Part D: Transport and Environment ; 47 ; 162-170
2016-01-01
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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