What are the reasons for the smog weather

Haze weather has also appeared in recent years. It is also a natural phenomenon that is harmful to our human body. There are many reasons behind the appearance of haze weather, among which the damage to nature is one of the most important reasons. After the haze weather occurs, we must pay enough attention to it, especially to take active measures. So, what are the reasons for the haze weather? Let’s take a look at it below.

1. Natural climate is the primary factor affecting the number of days with haze in cities

Large-scale smog weather mainly occurs in the autumn and winter seasons when the cold air is weak and the water vapor conditions are good under the large-scale atmospheric circulation situation, with calm or light winds near the ground and low altitude. Therefore, smog weather is more likely to form in mountainous and river valley areas (such as some cities in Shanxi, Changsha in Hunan, etc.) and plain river and lake areas (such as Nanjing, Hefei, Hangzhou, etc.), while it is not easy to form in dry and windy areas. For example, the number of haze days in Hohhot and Urumqi was zero in 2012. The smog weather in Beijing this time was mainly caused by rare inversion meteorological conditions.

(II) The “three highs” economic development model is the main reason for the increase in haze days in the central and eastern regions in recent years

In 2009, my country's energy consumption per thousand US dollars of GDP (constant price of 2000 US dollars, hereinafter referred to as unit energy consumption) was about 0.77 tons of standard oil, which is twice the world average of 0.31 tons. In the same year, the unit energy consumption of the United States, Britain and Japan was 0.19, 0.12 and 0.1 tons of standard oil respectively. In particular, my country's secondary industry has high energy consumption. In 2010, the three-sector industrial structure of my country was 10:47:43, but the energy consumption ratio of the three industries and their relationship with residents' lives was 2:71:16:11. A more prominent issue than the industrial energy consumption structure is the energy structure. In 2010, the proportions of coal (49.5% of which was used for thermal power generation), oil, natural gas, and electricity (including hydropower, nuclear power, and other power generation, excluding thermal power) in my country's energy consumption structure were 71.9:20:4.6:3.5 (the same applies hereinafter). During the same period, the world's coal consumption accounted for less than 30%, and the proportion of clean energy used in my country was obviously low.

3. Regionalization of air pollution and high carbonization of lifestyle are important reasons for the increase in haze days in some large cities

In 2011, Beijing's unit energy consumption was about 0.32 tons of standard oil, the three-industry structure was 0.9:24:75.1, and the proportions of coal, oil, natural gas and electricity in the energy consumption structure were 27.1:32.6:14.4:25.9, basically reaching the standards of major cities in the world. Data from the Beijing Municipal Environmental Protection Bureau showed that in January this year, the primary factor affecting Beijing's PM2.5 pollutants (an important cause of haze weather) was the impact of Beijing's surrounding areas (24.5%), followed by direct and indirect emissions from motor vehicles (about 22%). In some cities in the Yangtze River Delta and the Pearl River Delta, the contribution rate of external sources of some pollutants reaches 40%.

The increase in the number of haze days is not only a "natural disaster" but also a "man-made disaster" caused by air pollution. It is more likely to occur and has a greater impact in large cities with dense populations and industries. The fundamental solution is to take a multi-pronged approach and actively respond to air pollution.

The above are the reasons for the occurrence of smog weather. After the occurrence of smog weather, we must pay attention to the protection of nature, especially to do more greening. In addition, we must also learn to protect our bodies in smog weather. Everyone knows that smog is extremely harmful to the human body, so we must protect ourselves from preventive measures and diet.