Why is the smog in Harbin so serious?

The occurrence of smog is caused by the superposition of multiple factors, from inversion weather, coal pollution, dust pollution to dust generated by boiler fire. The increase of air pollutant emissions and the cold climate are the internal causes of smog weather in Harbin.

First, the meteorological conditions are unfavorable: the southwest upper air flow is weakened. On the ground, the cold air force is weak, controlled by the uniform pressure field, and a large-scale static and stable area appears, so the ground diffusion conditions are unfavorable. According to the analysis of sounding data in Harbin at night, there is obvious inversion on the ground in Harbin at night.

Second, the temperature plummeted, and the local coal-fired pollution increased: coal-fired pollution was the main pollution, followed by motor vehicle exhaust. According to the source analysis of pollutants, it is found that the proportion of coal-fired pollution in the ice city has increased in some periods, reaching the highest of 5 1.4%.