The Effect of a New Subway Line on Local Air Quality: A Case Study in Changsha

Posted: 8 Nov 2019

See all articles by Siqi Zheng

Siqi Zheng

Massachusetts Institute of Technology (MIT) - Center for Real Estate; Massachusetts Institute of Technology (MIT) - Department of Urban Studies & Planning; Hang Lung Center for Real Estate, Tsinghua University

Xiaonan Zhang

Tsinghua University - Department of Construction Management

Weizeng Sun

Tsinghua University

Jianghao Wang

Chinese Academy of Sciences (CAS) - Institute of Geographic Sciences and Natural Resources Research (IGSNRR)

Date Written: October 29, 2019

Abstract

Public transit is viewed as a potential means to mitigate traffic congestion and its resulting air pollution and health consequences. A recent wave of studies has emerged examining whether this public investment can achieve its goals. Employing the difference in difference method, this paper examines the medium-term effect of the opening of a completely new subway line on local air pollution in Changsha. Our findings show that carbon monoxide pollution, one key type of automobile pollution in areas close to the subway line experienced a greater reduction relative to areas further away from the stations in the first year after the subway line opened. However, there is no evidence that the opening of the subway line affected particulate matter or ozone pollution. Heterogeneity effects support that air pollution reduction resulted from substituting subway use for road use.

Suggested Citation

Zheng, Siqi and Zhang, Xiaonan and Sun, Weizeng and Wang, Jianghao, The Effect of a New Subway Line on Local Air Quality: A Case Study in Changsha (October 29, 2019). Available at SSRN: https://ssrn.com/abstract=3477357

Siqi Zheng

Massachusetts Institute of Technology (MIT) - Center for Real Estate ( email )

Building 9-323
Cambridge, MA 02139
United States

HOME PAGE: http://https://siqizheng.mit.edu/

Massachusetts Institute of Technology (MIT) - Department of Urban Studies & Planning ( email )

77 Massachusetts Avenue
Cambridge, MA 02139
United States

Hang Lung Center for Real Estate, Tsinghua University ( email )

HeShanHeng Building
Beijing, 100084
China

HOME PAGE: http://https://siqizheng.mit.edu/

Xiaonan Zhang

Tsinghua University - Department of Construction Management ( email )

Heshanheng Building
Tsinghua University
Beijing, 100084
China

Weizeng Sun (Contact Author)

Tsinghua University ( email )

No Address Available

Jianghao Wang

Chinese Academy of Sciences (CAS) - Institute of Geographic Sciences and Natural Resources Research (IGSNRR) ( email )

Beijing
China

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