On the basis of PM_2.5 data of the national air quality monitoring sites, local population data, and baseline all-cause mortality rate, PM_2.5-related health economic benefits of the Air Improvement Action Plan implemented in Wuhan in 2013–2017 were investigated using health-impact and valuation functions. Annual avoided premature deaths driven by the average concentration of PM_2.5 decrease were evaluated, and the economic benefits were computed by using the value of statistical life (VSL) method. Results showed that the number of avoided premature deaths in Wuhan are 21,384 (95% confidence interval (CI): 15,004 to 27,255) during 2013–2017, due to the implementation of the Air Improvement Action Plan. According to the VSL method, the obtained economic benefits of Huangpi, Wuchang, Hongshan, Xinzhou, Jiang’an, Hanyang, Jiangxia, Qiaokou, Jianghan, Qingshan, Caidian, Dongxihu, and Hannan District were 8.55, 8.19, 8.04, 7.39, 5.78, 4.84, 4.37, 4.04, 3.90, 3.30, 2.87, 2.42, and 0.66 billion RMB (1 RMB = 0.1417 USD On 14 October 2019), respectively. These economic benefits added up to 64.35 billion RMB (95% CI: 45.15 to 82.02 billion RMB), accounting for 4.80% (95% CI: 3.37% to 6.12%) of the total GDP of Wuhan in 2017. Therefore, in the process of formulating a regional air quality improvement scheme, apart from establishing hierarchical emission-reduction standards and policies, policy makers should give integrated consideration to the relationship between regional economic development, environmental protection and residents’ health benefits. Furthermore, for improving air quality, air quality compensation mechanisms can be established on the basis of the status quo and trends of air quality, population distribution, and economic development factors.

To achieve carbon neutrality, China is working toward a green transition where a key focus is to promote green innovation among privately-owned enterprises (POEs). Reverse mixed ownership reform, represented by the participation of state-owned capital, is a major direction in the current reform of Chinese state-owned enterprises (SOEs). Nevertheless, few studies have thoroughly investigated the impact of state-owned capital participation on green innovation in POEs. Thus, this research aims to analyze how state-owned capital influences POEs’ green innovations. Using an unbalanced panel dataset of 12,206 firm-year observations of Chinese listed companies from 2011 to 2019, we employ the fixed-effect ordinary least square (FE-OLS) as an effective estimation method to control unobserved individual heterogeneity and potential endogeneity. The results show that state-owned capital can significantly promote POEs’ green innovation. Mechanistic analyses suggest that state capital eases financial constraints and attracts more creative talent to work for the private sector, thus promoting green innovation. In addition, our baseline findings are more salient for enterprises with political connections, those operating in heavily polluting industries, and those located in areas with more stringent intellectual property rights (IPR) legislation. Finally, these findings are confirmed significant, even with endogeneity concerns and robustness checks being considered. The contribution of this research outlines the key role of state-owned capital in alleviating financial constraints and attracting talent to promote POEs’ green innovation.

The use of a free-trade zone (FTZ) has emerged as a smart land tool in increasing trading, attracting foreign investment, attempting financial openness and conducting other pilot economic reforms, which adds higher requirements for smart spatial planning, smart industry planning and smart management planning. However, no systematic analysis has been performed, making it difficult to provide deeper insights into FTZs. Thus, this study conducted bibliometric and visual analysis to identify the research status, new theories or practices, and potential future directions of FTZs based on 953 publications from the Web of Science Core Collection. The results show that there is a marked rise in the number of FTZ studies since 2013, which is the same year China authorized the first FTZ in Shanghai. China and the United States of America have played a leading role in FTZ research. Finally, the increasing trend in FTZ utilization will remain sizeable during its deepening development. The findings may contribute to a better understanding of FTZs and make some references to smart land-use planning experience and practices around the globe.