The Study On Characteristics Of Emission And Embodied Transfer Law Of Industrial NO_x In China

Since the 1990s,China has faced serious air pollution problems caused by the rapid development of industrialization.Since the implementation of air pollution control measures,the total emission of sulfur dioxide and smoke and dust has been effectively controlled,while the emission of nitrogen oxides has slowed down and even rebounded significantly,and industrial emissions are the main source.On this issue,taking China’s industrial source NOx emissions in 2017 as the research object,this paper studies the emission characteristics of industrial source NOx driven by final consumption,implied emission transfer law and key emission contribution supply chain from the three dimensions of industry,region and region industry.In this study,the key emission units of each dimension are discussed through multi regional input-output model(MRIO)and complex network analysis(CAN);The characteristics of implicit transfer are explained by analyzing the network topology;Based on structure path analysis,draw the implied emission flow map from final production contribution to final consumption contribution in the dimensions of industry and region,and extract the key emission contribution supply chain in the three dimensions;Finally,the implicit NOx intermediate transport volume of each unit in each dimension is counted;In addition,the modular division of regional industries is completed with the help of gephi software.The results show that:(1)the metal mining and processing industry in Hebei Province is the key contributor of production emissions,and the consumption emissions of mechanical equipment manufacturing industry in Jiangsu Province contribute the most;The key NOx transfer occurs within the region,mainly including "non-metallic mining and processing industry metal mining and processing industry → construction industry","metal mining and processing industry → mechanical equipment manufacturing industry";The biggest transfer direction among regions is the export of metal mining and processing industry in Hebei Province to the construction industry and mechanical equipment manufacturing industry in North and East China;(2)The inter industry and inter regional implied NOx transfer network does not have obvious small world characteristics and does not conform to the scale-free characteristics,while the regional inter industry implied NOx transfer network presents obvious small world and scale-free characteristics,and 20 communities are obtained through modular processing.The community boundary highly coincides with the administrative division,showing the geographical characteristics;(3)The supply path with high implicit emissions involves production layer 1 and production layer 2,which mainly occurs between industries within the region.The supply path of "Final consumption →Construction industry → Non-metal mining and processing industry" in Guangxi Zhuang Autonomous Region has the highest emissions;(4)Hebei Province,Jiangsu Province and Shandong Province have the largest implied NOx intermediate transmission in metal mining and processing industry;In addition,the significant intermediate transport effect of chemical industry in Shandong Province can not be ignored.In conclusion,this study proposes to implement targeted improvement measures for emission units with different dimensions and roles,and refine the consumption control of final products and intermediate products in each production link and the upstream supply chain rectification plan.