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China' s goal of achieving peak carbon emissions by 2030 is the fundamental foundation for its scheduled achievement of carbon neutrality by 2060. Taking 280 prefectural-level cities in China from 2006 to 2019 as the research object and the achievement of the carbon peak goal by 2030 as the rigid constraint, this study proposed the logic of 'symbiosis-co-governance-sharing' and focused on the characteristics of symbiosis on carbon emissions and air pollution. On the basis of the quantitative decomposition of the annual goal of reaching peak carbon emissions and the identification of the profit and loss deviation on both carbon emissions and air pollution, this study examined the co-governance synergistic effects of carbon and air pollution and the sharing paths. The results showed that: (1) The goal of reaching peak carbon emissions played a significant synergistic role in reducing pollution and carbon emissions, which could promote the development of cities from deviation to balance and optimization and promote the urban function of making ' bad to good, good to better, and better to best, (2) The synergistic effects of the carbon peak goal on reducing pollution and carbon emissions showed a significant heterogeneous selection effect. In China' s western cities, resource-based cities, environmental protection key cities, and first-mover cities, these effects played a more important role and had a stronger influence. (3) The sharing paths of the synergistic effects lay in the dual perspectives of 'internal' and 'external' source management-process control-end-of-pipe blocking and the dynamic matching of external environmental policy uncertainty. In the continuous promotion of the ' dual carbon' goals, close attention should be paid to carbon reduction and the optimization of the design of multiple sharing paths to enhance the synergistic effects of carbon and pollution reduction. In specific, we should: (1) strengthen source management, control total fossil energy consumption at the source, adjust industrial structure, and focus on energy saving and consumption reduction; (2) strictly control process management, investigate the pollution transfer phenomenon caused by differences in environmental regulation levels and the consequences of profit and loss deviation, and promote the construction of green transportation system through multi-wheel drive; (3) highlight end-of-pipe blocking, implement the whole process of governance, monitoring, and emission reduction, enhance green innovation and fully utilize carbon reduction and sink increase; (4) use dynamic adjustment to achieve internal and external matching and timely implement environmental policies according to local conditions so as to achieve adjustment and precise regulations on time. [ABSTRACT FROM AUTHOR]