At present, the coordinated promotion of pollution reduction and carbon reduction has become an inevitable choice for a comprehensive green transformation of economic and social development in the new stage. Can environmental protection interviews (EPI) improve the regional efficiency in reducing pollution and carbon? Taking 216 cities from 2008 to 2019 as the research object, based on the performance index of carbon haze collaborative governance calculated by SBM-DEA, comprehensive utilization of the methods of difference in difference (DID), this paper empirically examines the impact of EPI on the efficiency of coordinated governance of smog and carbon (ECGSC). The study found that EPI can promote ECGSC in the interviewed region, EPI mainly improve ECGCS through industrial structure optimization and green technology innovation, while the reduction of energy consumption intensity does not improve ECGSC. With the increase in the tenure age of the mayor, the decline in promotion expectations, and the rise in educational levels, the positive effect of EPI on the local region’s ECGSC will be more significantly. From the perspective of spatial spillover effect, EPI can significantly improve ECGSC in nearby region.