To provide technical support for metro station air quality improvement and provide a scientific basis for formulating relevant health standards through investigation of PM_2.5 concentrations in metro stations in Huangpu District of Shanghai.

Twenty-three metro stations in Huangpu District were selected to measure PM_2.5 concentrations and other relevant indicators on platforms and in concourses for statistical analysis.

The microclimate indicators such as temperature, relative humidity, and wind speed were controlled well in all selected spots. The concentrations of carbon dioxide were within relevant standard. In terms of PM_2.5 concentrations, there was no difference between non-transferable stations and transferable stations, between different time periods in one day, or between weekdays and weekends. As for seasonal distribution, PM_2.5 concentrations in spring and winter were significantly higher than those in summer and autumn. In addition, the metro platform sessions not equipped with platform screen doors showed higher concentrations of PM_2.5 than those equipped in the same stations.

It is recommended that platform screen doors be installed in more stations and hygiene management of air conditioning and ventilation systems be strengthened.