Table 12.
Robustness checks by using alternative specifications.
| (1) | (2) | (3) | (4) | (5) | (6) | |
|---|---|---|---|---|---|---|
| Deleting special cities | Controlling time trends | Adding other controls | Balancing panels | 2008-2018 | SO2 emissions | |
| DFI*Post13 | −0.0851*** | −0.0596*** | −0.0647*** | −0.0596*** | −0.0524*** | −0.0040*** |
| (0.0257) | (0.0189) | (0.0215) | (0.0191) | (0.0190) | (0.0011) | |
| Baseline controls | Yes | Yes | Yes | Yes | Yes | Yes |
| City FE | Yes | Yes | Yes | Yes | Yes | Yes |
| Year FE | Yes | Yes | Yes | Yes | Yes | Yes |
| Province-by-year FE | Yes | Yes | Yes | Yes | Yes | Yes |
| Adjusted R2 | 0.9769 | 0.9768 | 0.9769 | 0.9768 | 0.9787 | 0.8306 |
| N | 1669 | 1921 | 1807 | 1689 | 2598 | 1833 |
***
represent the significant levels of 1%. Parentheses indicate standard errors clustered at the county level. The baseline control variables are consistent with column (4) in Table 2.