Why is the air pollution in Heilongjiang serious?

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Experts believe that the main cause of smog formation in Harbin is meteorological conditions.

According to reports, last year, 65438+1October 20 was also the first day of heating, and the air quality in Harbin was good. According to the weather conditions of these two days compared with the same period of last year, there was just a snow in the ice city on October 20, 65438/kloc-0 last year, which was controlled by cold air and was more conducive to diffusion; Harbin is warming up under the influence of warm air this year, and the city is at the top of low pressure. Affected by weak cold air, the wind force is small, the atmospheric stratification is relatively stable, and the vertical direction is not conducive to the diffusion of pollutants.

The pollutants over Harbin were not accumulated in one day. There were signs of air pollution in Harbin as early as four days ago. At that time, Harbin continued to be controlled by high-pressure cold air, just like wearing a "hat" to the city to prevent the spread of pollutants. Then, the warm air from the south enters, which has brought some pollution to North China and cast a layer of dust on the air quality in Harbin. Until the calm wind yesterday morning, the horizontal direction was not conducive to diffusion, resulting in more and more pollution like "snowballing", which was held in the air and eventually formed smog.

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