Coal-based electricity of the Xilinguole League area in Inner Mongolia is not only an important foundation for the country's economic development and energy security,but also an ecological protective screen nearby the capital.And the construction of coal-based energy infrastructure in this region directly affects its ecological security.In this study,the atmospheric pollutant emissions from coal-fired power plants Xilinguole League and its air quality were investigated,and the spatial distribution of the atmospheric environmental capacity was analyzed.The spatial distribution of major pollutants was mapped and combined with atmospheric quality standards to obtain the atmospheric environmental capacity.Based on these results for different scenarios (low,medium,or high standards),the predicted regional atmospheric environmental capacity was calculated,and the regional environmental protection countermeasures were analyzed.These results provide a scientific basis for the conservation and regional sustainable development of Xilinguole League.