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Indoor air quality in subway microenvironments: pollutant characteristics, adverse health impacts, and population inequity
File(s)
Author(s)
Wang, Shunyao
Qin, Tianchen
Tu, Ran
Li, Tianyuan
Chen, Gang
Type
Journal Article
Abstract
Rapidly increasing urbanization in recent decades has elevated the subway as the primary public transportation mode in metropolitan areas. Indoor air quality (IAQ) inside subways is an important factor that influences the health of commuters and subway workers. This review discusses the subway IAQ in different cities worldwide by comparing the sources and abundance of particulate matter (PM2.5 and PM10) in these environments. Factors that affect PM concentration and chemical composition were found to be associated with the subway internal structure, train frequency, passenger volume, and geographical location. Special attention was paid to air pollutants, such as transition metals, volatile/semi-volatile organic compounds (VOCs and SVOCs), and bioaerosols, due to their potential roles in indoor chemistry and causing adverse health impacts. In addition, given that the IAQ of subway systems is a public health issue worldwide, we calculated the Gini coefficient of urban subway exposure via meta-analysis. A value of 0.56 showed a significant inequity among different cities. Developed regions with higher per capita income tend to have higher exposure. By reviewing the current advances and challenges in subway IAQ with a focus on indoor chemistry and health impacts, future research is proposed toward a sustainable urban transportation systems.
Date Issued
2024-08
Date Acceptance
2024-07-02
Citation
Environment International, 2024, 190
URI
URL
DOI
ISSN
0160-4120
Publisher
Elsevier
Journal / Book Title
Environment International
Volume
190
Copyright Statement
© 2024 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
License URL
Identifier
http://dx.doi.org/10.1016/j.envint.2024.108873
Publication Status
Published
Article Number
108873
Date Publish Online
2024-07-04