Removal of Gaseous pollutants using a mixed activated carbon bed in the subway

Subway´s air quality has been significantly affected by the outdoor air quality. Especially the most common compounds of concern associated with the subway system are volatile organic compounds(VOCs) and NO₂. In this study, only gaseous compounds (VOCs and nitrogen dioxide) were considered as target air pollutants. The removal efficiency of VOCs and NO₂ using mixed activated carbon bed was tested through a subway control method. It was found that the efficiencies on NO₂ and VOC removal were 77% and 83%, respectively when the mixed activated carbon bed was applied to the subway ventilation system in order to eliminate NO₂ and VOC at the same time.