How is the smog in Shenyang formed? The reason of smog in Shenyang.

Coal-fired heating+straw burning increases pollution emissions.

65438+ 10 month, the air quality in our city exceeded the standard for days 1 1 day, including light pollution 1 day, moderate pollution for 4 days, heavy pollution for 4 days and heavy pollution for 2 days. Especially in the late June of 10, there was persistent smog weather in our city. In this regard, Liu Zijing, deputy director of the Municipal Environmental Protection Bureau, said that the city is located in the northeast, and the urban heating is mainly coal-fired, and the air pollutants caused by heating are relatively large. The causes of recent pollution are mainly divided into two parts: internal and external causes.

First of all, the amount of air pollutants discharged into the environment in our city is large. 65438+ 10 entered the coal-fired heating period in late October, and the pollution emission increased; At the same time, millions of motor vehicle exhaust emissions and dust pollution at the turn of autumn and winter still exist; In addition, the autumn harvest season is also greatly affected by straw burning. According to the correlation analysis of air pollutant concentration, the concentrations of PM2.5 and PM 10 are directly proportional to the changes of carbon monoxide concentration. Because burning straw will produce a lot of carbon monoxide, which proves that the extreme weather in our city has a lot to do with burning straw in rural areas at this time.

Inverse temperature day+weak wind, "suppress" pollutants

At the same time, with the increase of pollution discharge, the weather conditions were not conducive to diffusion due to the influence of warm air in late June, 10. The horizontal wind near the ground is very weak, and the radiation near the ground has a strong cooling effect at night, which makes the ground temperature lower than that at high altitude at night, forming an "inversion layer", which leads to stable atmospheric stratification, unfavorable vertical diffusion and suppression of pollution in the air. In addition, when the last round of warm air hit, under the influence of the southwest wind, it also brought in a lot of foreign pollution, which caused the superposition of local pollution and aggravated the air pollution in our city.