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Title: Characterization of urban subway microenvironment exposure - a case of Nanjing in China
Authors: Mao, P
Li, J
Xiong, LL
Wang, RB
Wang, X
Tan, YT 
Li, HY
Keywords: Urban subway
Microenvironment exposure
Field sampling
Protective strategies
Standard update
Issue Date: 2019
Publisher: Molecular Diversity Preservation International (MDPI)
Source: International journal of environmental research and public health, 2 Feb. 2019, v. 16, no. 4, 625, p. 1-17 How to cite?
Journal: International journal of environmental research and public health 
Abstract: Environmental quality in public rail transit has recently raised great concern, with more attention paid to underground subway microenvironment. This research aimed to provide guidance for healthy urban subway microenvironments (sub-MEs) according to comprehensive micro-environmental categories, including thermal environment, air quality, lighting environment, and acoustic environment from both practical and regulation perspectives. Field sampling experiments were conducted in Nanjing Metro Line X (NMLX). Descriptive analysis, correlation analysis and one-way analysis of variance were used to investigate the status quo of urban sub-MEs. A paired samples t-test was then performed to compare among subway station halls, platforms, and in-cabin trains based on integrated sub-MEs. Results show that relative humidity, air velocity, respirable particulate matter (PM10) concentration, and illuminance dissatisfy the requirements in relevant national standards. Significant difference was observed in lighting environment between station hall and platform. It was detected platforms are warmer and more polluted than train cabins. Additionally, subway trains generate main noise on platform which is much louder when leaving than arriving. Protective strategies for sub-ME improvement as well as principles for updating standards were proposed from a proactive point of view. The findings are beneficial for moving towards healthy urban sub-MEs and more sustainable operation of subway systems.
ISSN: 1661-7827
EISSN: 1660-4601
DOI: 10.3390/ijerph16040625
Rights: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
The following publication Mao, P.; Li, J.; Xiong, L.; Wang, R.; Wang, X.; Tan, Y.; Li, H. Characterization of Urban Subway Microenvironment Exposure—A Case of Nanjing in China. Int. J. Environ. Res. Public Health 2019, 16, 625, 17 pages is available at
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