RESUMEN
Objective @#To investigate the pollution of metal elements in PM2.5 at the metro station by monitoring, so as to provide evidence for health protection strategies.@*Methods@#The PM2.5 concentrations on the platforms, in the tunnels, and above the ground of two selected metro stations in some city were collected and measured by electronic balance. The concentrations of Fe, Al, Cu, Mn, Ni, Pb, Zn, Cr, Ba and Cd in PM2.5 were determined by inductively coupled plasma mass spectrometry (ICP-MS). The pollution index (PI) and enrichment factor (EF) of these elements were analyzed.@*Results@#The concentration of PM2.5 was (101.46±32.88) μg/m3 on the platforms, (104.42±32.95) μg/m3 in the tunnels and (74.25±13.29) μg/m3 above the ground. The highest Fe concentrations were (33.19±5.93) μg/m3 on the platforms and (39.95±11.56) μg/m3 in the tunnels, accounting for (33.73±9.40)% and (42.72±17.17)% of PM2.5. The average PI values of Fe, Mn and Ba in PM2.5 on the platforms were 29.67, 9.24 and 7.13, in the tunnels were 36.30, 11.23 and 8.30, respectively, with very high level of pollution; the average EF values of Fe, Mn and Ba in PM2.5 on the platforms were 20.15, 4.55 and 4.33, in the tunnels were 19.44, 4.16 and 4.07, with serious, medium and medium level of enrichment, respectively.@*Conclusion@#The main metal pollutants in PM2.5 at the metro station are Fe, Mn and Ba, which are enriched in the metro environment.