This paper takes the digital transformation of cities as the research breakthrough point,uses the panel data of China city to quantitatively analyze the synergistic emission re-duction effect of CO2 and air pollutants,and analyzes the digital expansion mechanism in the coordinated emission reduction ac-tivities.The results show that,the synergistic emission reduction effect of carbon dioxide and air pollutants is widespread at the city level,and there are great differences between cities.Urban digital transformation is helpful to expand the scale of collabora-tive emission reduction,among which the dimensions of data and information infrastructure construction and industrial integration are the key to help collaborative emission reduction.Urban dig-ital transformation is an important expansion mechanism of air pollutant emission reduction caused by carbon emission reduc-tion.Furthermore,urban digital transformation can induce structural effects and technical effects,and promote coordinated emission reduction through source prevention and control and end treatment.However,the scale effect of urban digital trans-formation is not significant,and the process control channels of coordinated emission reduction are not smooth.The synergistic emission reduction effect of urban digital transformation has typi-cal heterogeneity of external environment and internal character-istics.
digital transformationcollaborative emis-sion reductionstructural effectscale effecttechnical effect
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