Abstract: Based on near-surface meteorological and environmental observation data, vertical profiles of meteorological parameters, and reanalysis data in Shenyang, Liaoning province, the multi-scale meteorological conditions of aerosol pollution during the same period of the National Winter Games of China in the past five years (from January 10 to the end of February in 2021~2025) were analyzed. The objective synoptic classification method was used to reveal the large-scale synoptic patterns on heavy pollution and clean days. In combination with vertical profiles of meteorological parameters, the