Metro and haze pollution:Evidence from Shanghai's raster data
The construction of public transportation infrastructure represented by the metro has a profound impact on haze pollution.Based on the mechanism explanation of the potential impacts of metro opening on haze pollution,this paper empirically examines the impact of the metro opening on haze pollution and its mechanism by using geographic raster data in Shanghai from 2000 to 2020 and the difference-in-differences model.The results show that the metro opening has a significant emission reduction effect.This conclusion still holds after a series of robustness checks.Heterogeneity analyses show that the opening of metro stations produces a stronger abatement effect on haze pollution,and the abatement effect of expanding stations on existing lines is relatively weaker,while the reduction effect of metro opening on haze pollution is more obvious in the raster samples with higher levels of haze pollution,higher population densities,and samples located in non-central urban areas.Further mechanism identification results show that the metro opening significantly increases the population density near the metro stations,especially near the stations located in the non-central urban area.This indicates that the metro opening reduces the level of haze pollution in the surrounding areas through the transportation substitution effect.The metro opening not only enhances commercial and residential land prices around the station,but also reduces the size of industrial land concessions,thereby promoting the entry of service enterprises and squeezing out manufacturing enterprises.This indicates that the metro opening makes industrial cleaner and more intensive around the station,which reduces haze pollution.
NETL
NSTL
万方数据
