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ID: 182732

Adapt by adopting cleaner vehicles? — evidence from a low-emission zone policy in Nanchang, China / Ye, Jingjing; Qin, Zhilong; Chen, Xiaoguang

Chen, Xiaoguang	Journal Article
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Summary/Abstract

We study how a low-emission zone (LEZ) policy affects air pollution in Nanchang, a medium-sized city located in southeastern China. By using a regression discontinuity design approach, we find that the LEZ policy improves Nanchang's air quality throughout restricted/unrestricted hours and within/outside of the designated LEZ areas. Air quality began to improve during the announcement period and improved further after the policy was enforced. These findings suggest that drivers could adapt to the foreseen LEZ policy by upgrading their vehicles; thus, to achieve policy effectiveness, it is important to make driving regulations compatible with drivers' incentives.

Key Words

China ; Air Pollution ; Driving Restrictions ; LEZ ; Announcement Effect

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ID: 187875

Driving restrictions, traffic speeds and carbon emissions: evidence from high-frequency data / Li, Tianshu

Li, Tianshu	Journal Article
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We investigate the effect of driving restrictions on traffic speeds and calculate the implied reduction in carbon emissions using empirical evidence from the city of Xi'an in China. We obtain high-frequency road-section-level transportation data from the Didi Chuxing Technology Company and use a regression discontinuity design (RDD) to identify the causal effect of driving restrictions on vehicle cruising speeds by exploiting a policy variation in 2018. We find that the driving restrictions led to an increase in vehicle cruising speeds of up to 15–20% during peak hours, which consequently dramatically reduced carbon emissions. Based on our back-of-the-envelope calculations, carbon emissions from private vehicles could be reduced by 2.2–5.8% thanks to increased fuel efficiency due to less traffic congestion.

Key Words

Carbon Emissions ; Congestion ; Driving Restrictions

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