Why is there frequent fog in Beijing, Tianjin and Hebei? Experts explain this?

The causes of haze should mainly include this:

Exhaust gas produced by automobile engine combustion. This needs more explanation. Under normal circumstances, the automobile exhaust after gasoline combustion generally does not contain PM2.5, but there are two situations: First, the quality of the automobile engine is not up to standard and it cannot be fully burned. Some cars emit black smoke for this reason; Second, gasoline is not up to standard and contains solid or industrial impurities.

Central heating in the North Coal is burned in the north of China (generally north of Huaihe River), and there will be central heating in winter. Central heating heats hot water by burning coal and provides hot water heating for every household. A large amount of coal is burned, and the emission treatment is not up to standard, resulting in a very large amount of soot in the air. So in the north, when you get off the plane, you will smell a faint smell of smoke, which also shows that among the causes of smog,

Exhaust emissions from steel mills, oil refineries, chemical plants and power plants.

When the outdoor wind speed is small, or the air convection is not obvious, the heat island effect and other conditions, it is possible to produce airflow backlog in the low-altitude areas of the city, so that the smog backlog in the urban area. Among several reasons other than the weather, who has the greatest influence is still inconclusive. But there is a view that it is probably like this: coal-fired heating 50%; Automobile exhaust 30%; Factory emissions: 20%.

Recently, however, some experts suggested that the new cause of smog was related to the melting of Arctic ice, which aggravated the air pollution in China.

According to the research report published in the online publication Science Progress of American Science magazine, the smog in eastern China lasted for several weeks at the beginning of 20 13, which was related to the melting of the Arctic Ocean ice layer the previous summer. Because the massive melting of ice and the increase of snowfall have changed the wind pattern in East Asia.

It is found that the unprecedented large-scale melting of Arctic Ocean ice in the summer of 20 12, coupled with the massive snowfall in Siberia, disturbed the wind direction pattern on the west coast of the Pacific Ocean, resulting in the obstruction of air circulation in East China.

The research team analyzed the air circulation data and climate-related factors in this area in the past 35 years. During the smog that lasted for nearly a month, 70% of 74 large and medium-sized cities in China were shrouded in polluted air.

According to the report, in view of global warming, the melting trend of the Arctic Ocean ice will continue, and the conditions leading to smog will continue to form. Scientists also believe that this will even pose a threat to the 2022 Beijing Winter Olympics. The venue of the Beijing Winter Olympics spans a large geographical area, and the impact of air pollution on this sports event will exceed that of the 2008 Beijing Summer Olympics.

It can be said that the air pollution in China is well known to the world, and it has become a hard indicator for the assessment of governments at all levels. There are different opinions about the causes of smog. Automobile exhaust emitted by industry has been chased and beaten, and various measures against them have also had general effects. Public opinion in various countries also accused the China government of sacrificing the environment in order to develop its economy. Now foreign experts have finally come forward to speak. They think that the change of the world polar climate has caused pollution to China.

So what we can do is:

Green Travel-It is recommended to use bus or carpool for short-distance travel. You can also ride a bike or walk when you have plenty of time, and it can also play a role in fitness.

Green life-choose clean energy and clean cookers for family kitchens. Choose energy-saving and environmental protection products for household appliances, such as low-energy refrigerators, washing machines, air conditioners, televisions, etc.

Green habits-shopping in plastic bags (environmental protection bags), drinking less bottled water, saving paper and setting off less fireworks. ...