本文利用2002年开始在六个省份实行的二氧化硫排污权交易政策所具有的“自然实验”性质,使用了基于全国省级面板数据的双倍差分模型,考察了二氧化硫排污权交易对单位产出二氧化硫排放强度的影响,研究结果发现二氧化硫排污权交易政策的实施确实降低了单位产出二氧化硫排放强度,同时也表明二氧化硫排污权交易政策在全国范围的推广具有重要的政策含义。 Based on the “natural experiment” nature of sulfur dioxide emissions trading policy implemented in six provinces since 2002, this paper uses the double difference model based on the provincial panel data to examine the effect of sulfur dioxide emissions trading on unit production The results show that the implementation of the sulfur dioxide emissions trading policy does reduce the intensity of sulfur dioxide emissions per unit of output, but also shows that the trading of sulfur dioxide emissions throughout the country has important policy implications.