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KMID : 1156220090350060463
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Journal of Environmental Health Sciences
2009 Volume.35 No. 6 p.463 ~ p.469
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PM₁? and CO₂ Concentrations in the Seoul Subway Carriage
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Sohn Hong-Ji
Ryu Kyong-Nam
Im Jong-Kwon
Jang Kyung-Jo
Lee Ki-Young
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Abstract
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The subway is the major public transportation system in Seoul with 2.2 million people using it everyday. Indoor air pollution in the subway can be a significant part of population exposure because of the number of people using the subway, time spent in transit and potentially high exposure for certain pollutants. The Korea Ministry of Environment has established the level 2 of recommended standards of PM₁? and CO₂ in subway trains. The aims of this study were to determine the airborne levels of PM₁?, CO₂ and any correlation between pollutant levels and number of passenger in a subway train. The airborne PM₁? and CO₂ were measured on the inside of trains on line #4 for 4 different days from October to November in 2008. Average PM₁? and CO₂ levels were 113±25 ㎍/㎥ and 1402±442 ppm, respectively. These levels did not exceed the level 2 of recommended standards of 250 ㎍/㎥ for PM₁? and 3500 ppm for CO₂. PM₁? level was not correlated with the number of passengers, while CO₂ levels were positively correlated with the number of passengers. The findings suggested that PM₁? in subway trains may have sources other than those directly associated with the number of passengers.
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KEYWORD
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indoor air, subway, pollutants, Seoul, passenger
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