Is there a place where there has never been smog?

Yes, my friends from Hainan and Inner Mongolia, they said that they had only heard of smog before going to university, and they had never experienced it.

Factors that form haze.

1. It is the physical base source for the generation of granular dust. China has the largest Loess Plateau in the world, and its soil texture is the most prone to the formation of particulate dust particles.

2. It is the poor movement that causes dust. For example, if mud flows onto the road after rain or splashing water on the flower beds in the middle of the road and on the corner of the street, after an hour of drying, it will be spun by the wheels and cause a lot of dust, and even if the particulate matter falls back to the ground, it will be thrown over the city again because cars continue to drive by.

3. The dust base source and the motion difference process are concentrated in a certain spatial range, and the particles eventually accumulate with the nodules of water molecules to form haze. At present, among the more than 350 cities in the Loess Plateau region of China, the stock of the three elements of haze structure is quite abundant.

Smog has been around since ancient times, and human activities or natural phenomena such as slash-and-burn farming and volcanic eruptions can lead to haze weather. However, after mankind entered the fossil fuel era, smog weather really threatened the living environment and health of human beings. Rapid industrialization and urbanization have led to rapid energy consumption, high population concentration, and ecological and environmental damage, all of which have laid the groundwork for the formation of haze weather.

First: it is car exhaust. Large vehicles that use diesel fuel are "repeat offenders" of PM10 emissions, including large buses, shuttle buses of various units, and large transport trucks.

Although gasoline-powered small cars emit gaseous pollutants, such as nitrogen oxides, they can easily be converted into secondary particulate pollutants in foggy weather, aggravating smog.

The exhaust of motor vehicles is the most important component of haze particles, and the latest data show that motor vehicle exhaust, coal, dust, and industry account for the smog particles in Beijing. However, with the advancement of automobile technology and the rise of oil quality, environmental managers have found that motor vehicle exhaust does not play a decisive role in the formation of haze weather, but as some cities with large car ownership, managers still need to control motor vehicle emission standards to avoid the formation of haze weather.

Second: the exhaust gases produced by burning coal for heating in winter in the north.

Third: exhaust gases emitted by industrial production. For example, metallurgy, kilns and boilers, mechanical and electrical manufacturing, as well as a large number of exhaust gases emitted from the combustion of kilns for automobile repair and painting and building materials production.

Fourth: Dust from construction sites and road traffic.

Fifth: the particle size of the growing particles, bacteria and viruses is equivalent to, when the humidity and temperature in the air are suitable, microorganisms will attach to the particles, especially the particles of oil smoke, and the microorganisms absorb the oil droplets and transform into more microorganisms, so that the growth of biological toxic substances in the haze increases.

Clause. Sixth, home decoration will also produce dust "haze", indoor dust is diffuse, not only harmful to the health of workers and users, increase the burden of cleaning, when the dust is serious, but also bring many hidden dangers to the decoration project.

In addition to meteorological conditions, the increase in the concentration of particulate matter (including coarse particulate matter PM10 and fine particulate matter) caused by industrial production, motor vehicle exhaust emissions, and coal burning for heating in winter is an important factor in the generation of haze. Nowadays, many cities are at a critical point in their pollutant emission levels, which are very sensitive to meteorological conditions, and air quality can meet the standard when diffusion conditions are good, and once encountering adverse weather conditions, air quality and visibility will immediately decline.