Table 1.
High pollution industry list.
Table 2.
Names of variables and sources of data.
Table 3.
Result of descriptive statistics of variables.
Fig 1.
Estimated value and confidence interval of threshold parameter in benchmark regression model.
Note: The blue line curve represents the likelihood ratio statistic (LR) of different threshold values γ, and the green horizontal line represents the critical value of LR at the 90% confidence level.
Table 4.
Benchmark model regression results.
Fig 2.
Parallel trend test of “Smart City” pilot policy.
Table 5.
The results of endogeneity test.
Table 6.
The results of robustness test.
Table 7.
The results of mechanism test.
Table 8.
The results of heterogeneity test.