信息化有利于降低雾霾污染吗?——基于空间计量模型的实证检验

Does Informatization Help Reduce Haze Pollution?An Empirical Test Based on Spatial Econometric Model

在分析信息化对雾霾污染影响的内在机理基础上,以2005—2015年中国285个地级及以上城市为样本,使用空间计量模型系统地考察了信息化对雾霾污染的影响。结果表明,在考虑雾霾污染的空间滞后性后,信息化有效降低了雾霾污染,在改变样本、替换变量、改变空间权重矩阵和考虑雾霾污染的时间滞后性等进行检验后,该结果依然稳健。考虑到模型的内生性问题,进一步使用工具变量法和广义空间两阶段最小二乘法进行估计,结果仍然显示信息化能显著降低雾霾污染。异质性检验结果显示,信息化的减霾效应在不同创新基础的城市具有显著差异,在不同经济发展水平城市不具有显著差异。证实了信息化在地级市层面具有减霾效应,为雾霾污染治理提供了政策启示。

Based on the analysis of internal mechanism of impact of informatization on haze pollution,taking China's 285 prefecture-level and above cities from 2005 to 2015 as a sample,the spatial econometric model is used to systematically investigate the impact of informatization on haze pollution.Considering the spatial lag of haze pollution.The results show that the informatization can effectively reduce haze pollution after considering the spatial lag of haze pollution.This conclusion remains robust after changing samples,measurements,spatial weight matrix and considering the time lag of haze pollution.Taking into account the endogeneity problems of the variables,this paper further uses the instrumental variable method and the generalized space two-stage least squares method to estimate.The heterogeneity test results show that the haze reduction effect of informatization has significant difference in cities with different innovation bases,but there is no significant difference in cities with different economic development levels.This paper confirms that informatization has the effect of haze pollution reduction at the prefecture-level city level,and provides policy enlightenment for haze pollution governance.