Characteristics of PM_(10) Levels Monitored for More than a Decade in Subway Stations in South Korea

Sangjun Choi ； Ju-Hyun Park ； Seo-Yeon Bae ； So-Yeon Kim ； Hyaejeong Byun ； Hyunseok Kwak ； Sungho Hwang ； Jihoon Park ； Hyunhee Park ； Kyong-Hui Lee ； Won Kim ； Dong-Uk Park

《Aerosol and Air Quality Research》 19卷12期 (2019/12) Pp. 2746-2756+ap1-7

https://doi.org/10.4209/aaqr.2019.05.0263

摘要

This study aimed to evaluate the variation in PM_(10) concentration and identify the factors influencing it in Korean subways during the past decade. The PM_(10) measured internally by subway companies according to legal requirements was categorized by the subway's characteristics, which were statistically examined using a mixed effects model to identify the relevant parameters. The average levels monitored near or on the platforms and in the waiting rooms ranged from 53.9 to 92.4 μg m^(-3), remaining below the Indoor Air Quality Control Act regulatory standard of 150 μg m^(-3). However, the levels monitored on the platforms far exceeded the average yearly atmospheric environmental standard (50 μg m^(-3)). Based on both univariate and multiple analyses, several subway characteristics, including the presence of a platform screen door (PSD), were found to significantly correlate with the concentration, although slight differences in the significant factors were detected between the cities. Particularly, the absence of transfer lines and the presence of a PSD reduced the platform concentration, except at Busan and during specific years.

關鍵字

Subway ； PM_(10) ； Platform screen door (PSD) ； Indoor air quality