Why is there smog in many parts of the country, but it is sunny in Beijing?

Because from time to time, a small stream of cold air goes south, just arriving in Beijing, pushing the dirty air south. Hebei, Shandong and Jiangsu are controlled by the quiet wind zone. Last night, the denatured cold and high pressure center was near Taizhou, Jiangsu Province, and the polluted air gathered and lasted for many days. Because from time to time, a small stream of cold air goes south, just arriving in Beijing, pushing the dirty air south. Hebei, Shandong and Jiangsu are controlled by the quiet wind zone. Last night, the denatured cold and high pressure center was near Taizhou, Jiangsu Province, and the polluted air gathered and lasted for many days. Because there was a strong wind in Beijing last week. Hangzhou has become a poisonous gas city. Last night, when the north was dry and the south was dry, I went to a tall building alone and sucked up the fog of the imperial city. Every morning in Beijing is foggy and dusty. In the afternoon, it is better to say that the sky is blue. I think it was windy. The pollution in Beijing was particularly serious yesterday. This is the most serious pollution process after Beijing gradually released PM2.5 concentration data last year. The data released by the Municipal Environmental Monitoring Center in real time is shocking. By 19, of the two urban environmental assessment points, 10 was severely polluted at level 6, and 1 was severely polluted at level 5. Among them, the air quality index of three stations reached the upper limit of 500. 1 1 Among the suburban EIA sites, except for the lack of data in Fangshan Liangxiang, there are 4 sites with serious pollution at level 6 and 2 sites with serious pollution at level 5. The index of three sites reached the upper limit of 500. It is understood that the greater the AQI value, the higher the level and category, indicating that the more serious the environmental air pollution, the greater the harm to human health. AQI*** in Changchun City is divided into six levels: excellent, good, light pollution, moderate pollution, heavy pollution and serious pollution. Meteorologists say that the smoke is mainly due to inversion. In addition, it is a coal-fired heating period, the wind is relatively small, the pollutants in the air are difficult to discharge, and the smoke has been filled.