What are the causes of smog and what are the causes of haze?

Causes: First, the physical base source for the generation of particulate dust. China has the world's largest loess plateau area, and its soil texture is the most prone to the formation of particulate dust particles.

The second is the dust caused by poor movement. For example, if the mud in the flower beds in the middle of the road and the corner of the street rains or splashes water on the road, after an hour of drying, it will cause a lot of dust to be blown by the wheels, and even if the particulate matter falls back to the ground, it will be thrown over the city again due to the continuous driving of cars. Third, 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. Treatment measures: reduce pollution sources and reduce air pollutants.

There are many factors for the formation of haze, most of them are caused by environmental pollution, the general urban environment is most likely to form, especially in developed cities, mainly because the city has many high-rise buildings that hinder the circulation of air, coupled with the weather heating up, so that the exhaust gas, industrial exhaust gas, dust and other accumulations of automobile emissions eventually form haze.

There are several reasons for this.

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 and 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.

4.Secondary pollution produced by the factory.

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

1.The relative humidity of the air near the ground is relatively large, and the ground is dusty, and the people and vehicles on the ground stir up the dust.

2.There is no significant cold air activity, the wind is small, and the atmosphere is relatively stable, due to the non-flow of air, the tiny particles in the air accumulate and float in the air.

3.The sky is clear and cloudless, which is conducive to radiative cooling at night, so that the air near the ground with relatively high humidity is saturated and condensed to form fog.

4.Secondary pollution produced by the factory.

There are many reasons for the formation of haze, but the main human causes are the following:

1. Automobile exhaust gas 2, coal burning 3, exhaust gas from industrial production 4, dust caused by industry, construction waste and highway traffic.

There are other reasons, such as the increase in static winds, which is not conducive to the diffusion and dilution of suspended particles in the atmosphere, and is easy to accumulate in urban and suburban areas, which also creates conditions for haze.

The main causes of haze are as follows: 1. The main factors of haze are not flowing or flowing poorly. The air does not flow, allowing tiny particles to collect in the air.

That's why the cold air haze dissipates as soon as it happens. 2. A large amount of polluted exhaust gas emitted by the factory chimney, and the haze can be summed up in one sentence: air pollution! The main polluters used to be these heavy industries.

3. Automobile exhaust emissions. I don't know if you have noticed, there are more and more cars in the city, which can be seen from the number of parking spaces, the more cars there are, the more exhaust emissions, and naturally the worse the air. 4. The humidity in the air is too low, and the movement of people and cars will bring up dust on the ground, which is a lot in the construction site.

Hope it helps!

The formation of haze is caused by both meteorological factors and other reasons such as pollution emissions. Unfavorable meteorological conditions are a direct inducement to the formation of haze.

Cause. North China is affected by the convergence of cold and warm air, and it is very prone to heavy weather.

As a result, air pollutants accumulate and air quality deteriorates, resulting in haze. Large pollutant emissions are the root cause of haze formation, according to environmental protection.

According to bureau statistics, half of the PM2 in the country .5 are from vehicle exhaust and construction emissions.

In fact, China's environmental protection laws are one of the most in the world, but there are long-term laws and regulations that are incomplete and the process is not complete.

The perfect situation has led to the further deterioration of China's air environment.

There are three main reasons for the formation of haze:

1. The physical base source for the generation of particulate field 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. Dust caused by poor movement. 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 dry temperature, it will be spun by the wheels and cause a lot of dust, and even if the particulate matter dissolves back to the ground, it will be thrown over the city again due to the continuous driving of cars.

3. The dust-based 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 haze structure is quite abundant.

In general, smog is usually caused by a combination of multiple pollution sources, mainly composed of sulfur dioxide, nitrogen oxides and respirable particulate matter, which combine with fog to make the sky instantly gloomy and gray. Its sources include automobile exhaust, industrial emissions, construction dust, garbage incineration, volcanic eruptions, etc.

Fog. Fog is formed by radiative cooling, and most of them appear at night and early in the morning when it is clear, breezy, and near-ground water vapor is relatively abundant and stable, or there is a temperature inversionThe other is the horizontal movement of warm and moist air, passing through the cold ground or water surface, the water vapor in the air is gradually liquefied by the cold and forms a fog, which is called advection fog in meteorology;

Sometimes fog formed for both causes is called mixed fogIt can be seen that those who can meet these conditions are late autumn and early winter, especially in the morning of late autumn and early winterSmog in cities is caused by another cause, and that is human activity...

Morning and evening are the peak period of heating boilers, and a large number of pollutants such as soot, suspended solids and automobile exhaust are not easy to diffuse under the conditions of low pressure and low wind, and combine with the water vapor in the low-level air to form smoke (fog), and this smoke (fog) often lasts for a long time

Haze weather mostly occurs in basins or places with relatively low terrain. The biggest reason is that the air pressure in the atmosphere is low, and the air does not flow. And the non-flow of air causes tiny particles in the air to accumulate and float in the air.

Haze is divided into human factors and climatic factors, of which the human factors are mostly caused by factors such as automobile exhaust, coal burning, home decoration, construction sites and industrial exhaust gases, and most of the climatic factors are caused by the increase of static wind in the horizontal direction and the occurrence of temperature inversion in the vertical direction.

1.It's 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.

2.In the north, the exhaust gases produced by burning coal for heating in winter.

3.Exhaust gases emitted from industrial processes. 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.