Objective To investigate the concentrations and distributions of PM10 and PM2.5 in Shanghai metro stations so as to provide scientific basis for environmental improvement and establishment of relevant hygiene standard.
Conclusion Two underground metro stations were selected for the study. The levels of PM10 and PM2.5 were measured on one workday in every two weeks from March to May, 2013. The measurement was conducted three times (morning, noon, and evening) a day. Sampling sites included tunnels, platforms, station halls, and outdoor air shafts.
Results The average levels of PM10 in the tunnels and platforms were significantly higher than those in the station halls and air shafts (P< 0.05). The levels of PM2.5 were even among different sites (P> 0.05). The particulate matter levels varied in different measuring time points: the PM10 levels in the tunnels and platforms were significantly higher in morning and evening than in noon (P< 0.05), and those in the station halls were significantly higher in morning than in noon and evening (P< 0.05). The time variation of PM2.5 was similar to PM10 in the tunnels and station halls, while in the platforms, the levels of PM2.5 in morning, evening, and noon were in a decreasing manner (P< 0.05).
Conclusion In the underground metro stations, the levels of particulate matter vary with time and location, indicating that the particulate matter pollution in Shanghai metro stations should be paid more attention to.
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