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The trading of carbon emissions is a crucial regulatory method to address environmental pollution issues. This study takes China's carbon emission trading pilot policy established in 2013 as a quasi-natural experiment and uses the DID model to empirically test the urban panel data from 2006 to 2019. The results show that the carbon emission trading pilot policy can effectively reduce urban environmental pollution, and this effect is more noticeable in mid-western cities, northern cities, cities with fewer resources, and large-scale cities. In addition, to address the urban environmental pollution problem through this policy, the government is encouraged to raise its environmental protection awareness and put more effort into the innovation of technology. In general, this study uses carbon emission trading policies from China to confirm that market-based incentive environmental regulation tools can effectively reduce environmental pollution in urban areas. These findings can provide more theoretical support and empirical evidence for the government to use mechanisms of the market to effectively solve pollution problems, improve ecological environment quality, and accelerate the realization of green economy. • The DID model is used to track pilot policy impact on urban environmental pollution. • Carbon emission trading pilot policy can reduce urban environmental pollution. • The government's environmental awareness is the channel of action. • The government's technological innovation efforts are the channel of action. [ABSTRACT FROM AUTHOR]

The rapid growth of foreign investment is a double-edged sword, which not only drives China's rapid economic development, but also aggravates China's energy shortage and environmental pollution. Chinese government has strengthened environmental regulations with the intention of restricting the entry of foreign investment, improving the quality of foreign direct investment (FDI). However, the effect of environmental regulation on the quality of FDI has not been carefully examined yet. This study constructs a panel model and uses the panel data of 30 provinces in China from 2009 to 2018 to scrutinize the effect of different types of environmental regulation policies on the quality of FDI. The results show that the strengthening of environmental regulation policies can improve the quality of FDI and avoid making China a "pollution paradise" for FDI. There are significant differences in the effects of different types of such policies on the quality of FDI; the type of administrative supervision and social participation policies play positive roles in improving the quality of FDI. There are also significant differences in the strategies for attracting foreign investment among different regions, as well as in the focuses of their environmental regulation objectives. Therefore, for environmental regulation policies to play a more positive role in promoting the quality of FDI and the high-quality development of the national economy, this study suggests that it is necessary to further implement the policy of opening up to the outside world, optimise foreign investment structures, deepen opening up to the outside world, optimise the structure of foreign investment, deepen the reform of the environmental supervision structure, tighten the law enforcement of environmental protection, seek accurate environmental regulation based on the realities of regional foreign investment development, take multiple measures to improve the business environment to promote the quality and efficiency of foreign investment, and so on. Image 1 • Strict environmental regulation policy can improve the unit scale and unit benefit of FDI. • Distinguish and test the potential effects of different types of environmental policy tools on the quality of FDI. • Administrative supervision policy and social participation policy can improve the quality of FDI more effectively. • Sustained improvement of FDI quality depends on coordinated advances in economic, political, and environmental reforms. [ABSTRACT FROM AUTHOR]