Fig. 4: Trends of local environmental pollution in the treatment and control groups.
From: Does the green patent pre-examination program reduce environmental pollution?
Figure 4 displays the temporal trends in the average number of industrial sulfur dioxide and dust emissions for treated and control groups. The horizontal axis represents the time relative to policy implementation, while the vertical axis indicates the annual average emission levels. A red dashed line marks the policy implementation year as a reference point for evaluating pre- and post-intervention effects.
