If there are effective dust removal measures, why does coal burning still cause smog days?

Smog is particulate matter that is less than a micron in diameter, and although it looks like fog, it is solid.

Causes of haze:

Coal straw burning, which is also a reason why the northern winter is prone to haze.

Vehicle exhaust emissions.

Industrial exhaust emissions, the main smog in London that year**.

All kinds of dust in life, dust and water vapor combined to float in the air will form haze.

Hazards of smog:

1.It is harmful to the respiratory system, easy to cause acute rhinitis, bronchitis, and may cause lung cancer in severe cases.

2.It causes cardiovascular and cerebrovascular diseases, leading to cardiovascular disease, hypertension, coronary heart disease, cerebral hemorrhage, may induce angina, myocardial infarction, heart failure, etc., and causes chronic bronchitis to cause cor pulmonale.

3.Affects male fertility.

Prevention and control of smog: The overall management depends on the state, but we must also have a sense of prevention.

1.Exercise time and intensity are appropriately reduced outdoors.

2.When you go out to wear a mask, it is recommended to buy a lot of masks at a time, and cut one after two or three days to see the condition of the filter element, so as to judge the use cycle and effect of each mask.

3.Protect your lungs, eat more foods that nourish your lungs, and drink plenty of water.

4.Indoor air purification: the effect of the air purifier is not very good, it is best to install a set of Haoting household ductless fresh air system in your own house, the PM value of the air outlet can reach 0, and the PM value in the whole room is also between 7-15, the effect is very good.

Having a facility doesn't necessarily mean using. If you can save it, you can save it. Anyway, the people are so foolish.

a. When using coal fire for heating in winter, insufficient coal combustion is easy to produce toxic carbon monoxide gas, which can poison people, so the choice is correct

b. Carbon dioxide is not toxic, so the option is wrong

c. When using coal fire for heating in winter, insufficient coal combustion is easy to produce toxic carbon monoxide gas, which poisons people, instead of sulfur dioxide, so the choice is wrong

d. When using coal fire for heating in winter, insufficient coal combustion is easy to produce toxic carbon monoxide gas, which poisons people, rather than hydrocarbons, so the choice is wrong

Therefore, a

No, smog is haze, dust is dust, and the main contents are not ordinary.

Haze is a combination of fog and haze. Smog is common in cities. In many parts of China, fog is combined with haze as a disastrous weather phenomenon for early warning and forecasting, collectively known as "haze weather".

Smog is the result of the interaction of specific climatic conditions with human activities. The economic and social activities of high-density populations will inevitably emit a large amount of fine particulate matter (pm, once the emission exceeds the atmospheric circulation capacity and carrying capacity, the concentration of fine particulate matter will continue to accumulate, and if affected by static weather, it is very easy to appear large-scale haze.

Dust is an open source of pollution that enters the atmosphere due to the dust on the ground being blown by wind, man-made and other drives, and is an important part of the total suspended particulate matter in the ambient air.

It is one of the reasons for the formation of haze, the components of smog are sulfur dioxide, nitrogen oxides and inhalable particulate matter, which are the main components of haze, and the specific reasons for the formation of haze are:

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

2. There is no obvious cold air moving beams, the wind is small, and the atmosphere is relatively stable, because the air does not flow, so that the tiny particles in the air accumulate and float in the air;

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

Fourth, automobile exhaust is the main pollutant emissions, in recent years, there are more and more cars in the city, and the emission of automobile exhaust is a factor of haze;

5. Secondary pollution caused by the factory;

6. CO2 and other pollutants emitted during heating in the winter season.

No, now that the population is increasing, and there are more types of food, farting is more smelly, which is the most important factor in the composition of smog.

The largest pollutant in the haze is the large combustion of coal, the formation of the haze as a "chemical reaction", then the maximum "reactant" is the combustion of coal, followed by motor vehicles, and the climate and terrain conditions are the "reaction conditions" are the most important pollutants in the haze. Including primary particulate matter, mainly from industrial smoke and dust, motor vehicle exhaust, dust, etc., straw burning in rural areas is also short-term disposable particulate matter**, and secondary particulate matter, that is, sulfate, nitrate, organic carbon, etc., which are formed by the transformation of atmospheric chemical processes. Perennial, secondary pollutants account for about 40 50%, and haze is different, generally at this time for the "quiet" weather, the wind is small and the diffusion ability is poor, dust and other primary particulate matter contribution will be relatively small, sulfate and nitrate and other hygroscopic components (secondary particulate matter) is the main cause of haze, and the precursor of secondary particulate matter is sulfur dioxide, nitrogen oxides, volatile organic compounds, etc. emitted from pollution sources.

Emissions of sulfur dioxide, nitrogen oxides and soot from direct combustion of coal account for % and 44% of the country's total emissions, respectively. Emissions of sulfur dioxide, nitrogen oxides and soot from key coal-related industries accounted for 23% and 23% of the country's total emissions, respectively. All emissions of sulphur dioxide, nitrogen oxides and soot associated with coal use accounted for 67% and 67% of the country's total emissions, respectively. The air pollutant emissions from the direct combustion of coal here refer to the air pollutant emissions generated by power station boilers (mainly the production and industry of electricity and heat), coal-fired industrial boilers (the main form of coal utilization in the industrial industry) and civil coal-fired equipment, and the air pollutant emissions of coal-related key industries mainly refer to the air pollutant emissions generated by coke ovens, various kilns and other equipment in the production of coke, steel, cement, non-ferrous metals, etc., as well as the relevant process although coal is not directly consumed. But dust emissions are closely related to production.

Smog is a non-scientific term. Fog is a natural phenomenon, water vapor. Haze is the result of suspended particulate matter being concentrated in an area of the atmosphere.

Naturally occurring haze is the result of natural fire products and wind causing ground soil dust, and artificially generated haze is caused by artificial dust (by-products of screening, crushing, construction, excavation, etc.) and combustion (fire, domestic heat, industrial heat, energy production, energy consumption, etc.). The burning of coal is one of the parts. Reducing coal burning can reduce the production of smog, but it is not entirely caused by the use of large amounts of coal.

Moreover, the causes of smog are very complex, and are related to both human activities and climate. Human activities are changing the environment and affecting the climate. Urban climate, a typical type of human influence, has also begun to be studied and paid attention to.

A large factor in the formation of haze is the overall or local anomalies of the climate, human activities affect the climate and environment all the time, not only in China, but also in the process of industrialization in Western countries, there have been similar serious haze phenomenon.

The use of coal has brought smog, which is undeniable. But it's a bit unfair to attribute the smog mainly to coal. China has experienced 30 years of rapid growth, economic growth is inseparable from the growth of energy, during this period, coal as a primary energy, accounting for about 70% of China's total energy consumption, but China's current energy structure wants to change quickly is unrealistic, can only gradually reduce fossil energy, especially reduce coal, while developing new energy, this process will take at least 20 years.

At this stage, while vigorously developing renewable energy, we should firmly grasp the clean and efficient use of coal, and make efforts in efficient power generation and coal chemical industry.

At present, the air quality in our country is seriously declining, especially in the areas north of the Yellow River, especially in the region, and the smog here is also quite serious. Because the haze is uncontrollable, it flies into the sky with the atmospheric circulation, bringing environmental pollution and physical harm to people. There are certain reasons for the massive use of coal, so what are the main causes of smog?

Clause. 1. Thermal power generation in the north. In order to support the construction of the motherland and the lives of residents, thermal power generation has been in the first place, so the burning of coal for thermal power generation directly leads to air pollution.

This is an issue that cannot be ignored. The direct contribution rate of coal to the haze phenomenon is about 25%, which shows that the unreasonable energy consumption structure is one of the important reasons for the haze.

Clause. 2. Winter heating. In addition to central heating, there are also briquettes, a necessary heating tool for every household.

Due to cost and quality problems, the quality of some honeycomb coal is seriously substandard, which causes the sulfide in the air to rise sharply, resulting in serious air pollution, and the coal combustion is not sufficient, and toxic gases will be released.

Clause. 3. Emissions of automobile exhaust. With the improvement of people's living standards, there are more and more car owners, which leads to serious automobile exhaust emissions in cities.

China has become the world's second largest automobile market and the third largest automobile manufacturing base. The environmental pollution problem of urban motor vehicles is becoming more and more serious, not only exhaust gases, but also dust particles.

Clause. Fifth, the relevant departments do not pay attention to environmental issues. Although the state has been advocating both gold and silver, but also lucid waters and green mountains, but some of the leading departments blindly pursue economic benefits, which has caused serious pollution problems.

Now that the country is vigorously rectifying, I believe that the future will be a world of green mountains and clear waters.

Haze is a combination of fog and haze. Smog is common in cities. In many parts of China, fog is merged into haze as a disastrous weather phenomenon for early warning and forecasting, collectively known as "haze weather".

Smog is the result of the interaction of specific climatic conditions with human activities. The economic and social activities of high-density populations will inevitably emit a large amount of fine particulate matter (pm, once the emission exceeds the atmospheric circulation capacity and carrying capacity, the concentration of fine particulate matter will continue to accumulate.

In addition to burning coal for heating, there are a few other 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.

Second: 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.

Third: fugitive dust from construction sites and road traffic.

Fourth: 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. Fifth, 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.

a. Using coal as fuel, the combustion products contain a large amount of smoke, dust and other particles, which will form haze, so it does not meet the topic;

b. Open burning of garbage, the combustion products contain a large amount of smoke, dust and other particles, which will form haze, so it does not meet the theme;

c. The exhaust gas of the automobile contains a large amount of smoke, dust and other particles, which will form haze, so it does not meet the topic;

d. The product of hydrogen combustion is only water, which will not form particles, such as smoke and dust, and will not form haze, so it is in line with the topic;

Therefore, choose D