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In this study, the air quality of underground and overground railway stations was evaluated focusing onthe degree of influence of the outside air quality. The measured components were particulate matter (PM 10 ), carbon dioxide (CO 2 ), carbon monoxide (CO), nitrogen dioxide (NO 2 ), formaldehyde (HCHO), ozone (O 3 ), total airborne bacteria (TAB), total volatile organic carbon (TVOC), and Radon (Rn), which are included in the maintenance standards and recommended standards of the Indoor Air Quality Management Act. Also, the indoor/outdoor concentration ratios of PM10, NO 2 , and O 3 were calculated to estimate the influence of the outdoor air quality. Theconcentrations of PM10 HCHO, TVOC, NO 2 , and Rn in the underground stations were found to be higher than thosein the overground stations. These results indicate that the (present) generation of contaminants are caused by the indoor source of the underground station. The ozone concentration of the overground stations was higher than thatof the underground stations, which indicates that the outdoor ozone concentration influenced that of the overgroundstations directly. Thus, methods of improving the IAQ should take into consideration the types of contamination

Characteristics of indoor air quality in the overground and underground railway stations