SEOUL, SOUTH KOREA, March 8, 2018 – Seoul Metro, a city government’s organization to operate subways in Seoul, has recently completed the installation of “indoor air quality improvement” devices on new subway trains for the first time in Korea.
Each device has a capacity that purifies the whole air inside the subway train every 12 minutes. Its dual filters capture dust particles at first, and then filter out fine dusts. A total of 100 air purifiers have been set up on five subway trains so far. Seoul Metro plans to add more 300 devices to 15 trains by the end of this year.
Seoul Metro tested the air-improving device starting from September 2017, and found that the train with the device had a lower density of fine dust by 8.15 percent on average compared to the train without it. Especially during the rush hours from 7am to 9am, fine dust is lowered by 12.3 percent, while being decreased by 4 percent during the non-rush hours from 9am to 6pm. In case of Sinchon Station, one of the busiest stations, the density of fine dust during the rush hours had been decreased by 34.2 percent.
Seoul Metro explains even when air purifiers are not operated, a density of fine dust during the rush hours reaches 102㎍/㎥ on average, and 74㎍/㎥ during the non-rush hours, which is still way lower than the air environment standards of 200㎍/㎥ set by the Ministry of Environment of Korea.