What is the reason for the bad weather and air in Shanghai?
Reasons for the formation of smog weather in Shanghai
1. When the atmospheric air pressure is low and the air does not flow, the main factors are. Because the air does not flow, the tiny particles in the air gather and float in the air.
2. The ground is dusty and the air humidity is low. People and traffic on the ground stir up the dust.
3. Automobile exhaust is the main pollutant emission. In recent years, there are more and more cars in cities, and the automobile exhaust is a factor of smog.
4. Secondary pollution produced by factories.
5. CO2 and other pollutants emitted by heating in winter.
The foggy weather in Shanghai is mainly influenced by meteorological factors, and heavy fog and calm weather are also not conducive to air diffusion. "Maybe many people are entangled. When will this heavy pollution be the end? How to alleviate it? " Liu Jianlin made an analogy. Heavy pollution is a process. For example, it is C, which is caused by two factors: A and B. A is the production and living factor, and B is the meteorological condition.
meteorological conditions can't be controlled, so you have to control a yourself. It is understood that among the major causes of smog in Jiangsu, industrial waste gas ranks first, and the annual consumption of coal in Nanjing alone is equivalent to 27.4 billion pieces of honeycomb coal, followed by private cars, with an average of 98.4 kilograms per vehicle per year, and dust on construction sites ranks third. "The atmosphere needs joint prevention and control, and all regions struggle with breathing, and everyone has a responsibility." She stressed that environmental protection alone will definitely be a drop in the bucket.
Meteorologist: It is rare to see such a large-scale persistent heavy smog.
Recently, He Lifu, chief forecaster of the Central Meteorological Observatory, analyzed the meteorological background of this large-scale and persistent smog weather in an interview with the media. From November 26 to 28, the first cold wave weather process occurred in the central and eastern regions of China since the winter of this year, and it ended at the end of the month. In the early stage, the ground was controlled by dry cold air. With the cold high pressure entering the eastern sea, its power gradually weakened, and most parts of the central and eastern regions were controlled by denatured high pressure. The atmospheric stratification was stable and the ground wind was small, which was not conducive to the diffusion of pollutants. At the same time, the temperature began to rise slowly from November 29, from the north wind to the southerly wind, and the humidity near the ground slowly increased, creating conditions for the formation of smog.
compared with usual, severe haze with large scope and long duration and local PM2.5 concentration of more than 3 μ g/m3 is really rare in East China such as Jiangsu and Shanghai. On the one hand, after the cold high pressure enters the sea from East China, the denatured high pressure is located on the eastern coast, which makes the ground humidity increase rapidly; On the other hand, due to the weak northerly wind in the early stage to the weak southerly wind in the later stage, it is more conducive to the collection of surrounding pollutants in this area.