Fig 1.
Logic of this research.
Fig 2.
Hypothesized conceptual model and research framework.
Table 1.
Index system of the three subsystems.
Table 2.
Descriptive statistics of the variables.
Table 3.
Evaluation criteria of the degree of coupling coordination.
Fig 3.
Cities’ degree of coupling of the digital economy, industrial structure supererogation and pollution reduction.
Fig 4.
Cities’ degree of coordination of the digital economy, industrial structure supererogation and pollution reduction.
Table 4.
Results of the benchmark model.
Table 5.
Results of the robustness test of the benchmark model.
Table 6.
Results of the heterogeneity test.
Table 7.
Results of the mediation and robustness tests.
Table 8.
Results of the heterogeneity of the mediating effect.