Table 1.
The parallel trends test for the variables.
Fig 1.
The map of the NKEFZ and the non-NKEFZ in China.
The map is completed by ArcGIS software. The green areas are the treatment group which the counties belong to the NKEFZ, and the red areas is the control group which the counties belong to the non-NKEFZ. As some counties have no data, they are not included in the study sample, where these areas are shown in white on the map.
Table 2.
NKEFZ and the environmental quality, baseline estimates.
Table 3.
Robust checks.
Table 4.
Estimated results of matching.
Table 5.
Estimated results of PSM-DID model.
Fig 2.
Those figures are based on the estimated results in columns (2), (4) and (6) of Table 6, with a confidence level of 5%.
Table 6.
Estimated results of time trend analysis.
Table 7.
Mechanisms analysis.