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The growth in PM2.5 concentration and the increasing wind speed at high altitudes lead to the upward trend in PM2.5 flux. As the altitude increases, the high-value area of PM2.5 concentration tilts towards the warm air mass. The transit of the cold front at night led to more unstable convection within the boundary layer; the height of the boundary layer increased from north to south, reaching over 1 km, breaking the rules characteristic of the diurnal evolution of the boundary layer. The results indicate that the combination of vertical