Reports on smog, the cause of smog formation

Causes of haze formation:

1. The physical base source for the generation of particulate 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.

Second, the poor movement 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.

Third, the dust-based source and the motion difference process accumulate within a certain spatial range, and the particles eventually accumulate with the nodules of water molecules to form haze.

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.

Haze components

Smog is mainly composed of sulphur dioxide, nitrogen oxides and inhalable particulate matter, the first two are gaseous pollutants, and the last particulate matter is the main cause of haze weather pollution, which combines with fog to make the sky instantly gloomy and gray.

The English abbreviation for Particulate Matter is PM, and Beijing monitors fine particulate matter, which is pollutant particles with an aerodynamic equivalent diameter of less than or equal to microns. The particles themselves are both a pollutant and a carrier of toxic substances such as heavy metals and polycyclic aromatic hydrocarbons.

Why are smog days getting worse and worse? This is a question that everyone is thinking about. In fact, we will find that after the rapid development of the city, the smog is getting worse and worse, so in more cases, the smog is caused by toxic particulate matter in the city.

So, what are the causes of smog?

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.

The above are some of the more common urban toxic particles in modern cities, and it is precisely because these toxic particles cannot be well treated that they also bring more and more serious haze. We know that smog can bring a lot of harm to the body and even threaten the health of life. Therefore, it is urgent to control smog.

Smog is a mixture of fog and haze, and there is a big difference between fog and haze. The aerosol system composed of dust, sulfuric acid, nitric acid and other particles in the air causes visual impairment called haze. Haze is haze (haze). The causes of smog are roughly as follows:

1.The main factor is when the atmospheric air pressure is low and the air is not flowing. Due to the non-flow of air, tiny particles in the air accumulate and float in the air.

2.The ground is dusty, the air humidity is low, and the people and traffic on the ground stir up the dust.

3.Automobile exhaust is the main pollutant emission, and in recent years, there are more and more cars in the city, and the emission of automobile exhaust is a factor of smog.

4.Secondary pollution produced by the factory.

5.Pollutants such as CO2 emitted from heating in winter.

Now the smog has swept over most of China, and many cities have begun to use the 99 smog removal vehicle, which has alleviated and suppressed the smog to a certain extent.

Smog is the formation of dust in the air like fog weather, construction, transportation, car exhaust, burning straw are all related!

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