What kind of smoke does it blow in the northern weather in winter?

Smoke bomb. The northwest wind blows in winter in the north. In winter, the temperature in Siberia drops rapidly, and the temperature difference between Siberia and northern China is large. Once there is a temperature difference, different pressure zones and winds will be formed. Due to the Siberian high, the airflow moves from high pressure to low pressure, resulting in an anticyclone centered on Siberia, and China is at a low pressure. Coupled with the effect of geostrophic deflection, northwest wind often blows in winter in northern China.