For the weather pollution, the national government's implementation of environmental protection has not completely solved it. Let's talk about what measures should be taken to protect it.

Air pollution sources can be divided into natural and man-made two categories. Natural pollution sources are formed due to natural causes (such as volcanic eruptions, forest fires, etc.). ), and man-made pollution sources are formed because people are engaged in production and life activities. Among man-made pollution sources, it can be divided into fixed (such as chimneys and industrial exhaust pipes) and mobile (such as cars, trains, planes and ships). Due to the prevalence and frequency of man-made pollution sources, people pay more attention to them than natural pollution sources. The main air pollution sources are:

(1) industrial enterprises are the main source of air pollution and one of the key points of air hygiene protection. With the rapid development of industry, the types and quantities of air pollutants are increasing. Due to the different nature, scale, technological process, raw materials and product types of industrial enterprises, the degree of air pollution is also different.

(2) Living stoves and heating boilers in residential areas, with the concentration of population, a large number of civil living stoves and heating boilers also need to consume a lot of coal, especially in winter heating time, which often makes the polluted areas filled with smoke, which is also an air pollution source that cannot be ignored.

(3) Transportation In recent decades, due to the development of transportation, more and more cars are driving in the city, and passenger and cargo transportation such as trains, ships and planes is frequent, which has added new air pollution sources to the city. Of great significance is the exhaust gas emitted by cars. The characteristic of automobile air pollution is that the pollutants discharged are close to people's breathing zone and can be directly inhaled by people. The exhaust gas from automobile internal combustion engines mainly contains carbon monoxide, nitrogen oxides, hydrocarbons (hydrocarbons), lead compounds and so on.

(B) the harm and impact of air pollution

The harm and influence of air pollution on human beings and their living environment has been gradually recognized by people, which can be summarized as follows:

① Harm to human health. There are three ways for human body to suffer, that is, inhaling polluted air, skin contact with polluted air, and eating food containing atmospheric pollutants, which will not only cause respiratory and lung diseases, but also harm cardiovascular system and liver, and even seriously endanger people's lives.

② Harm to living things. Animals get sick or die from inhaling polluted air or eating food containing pollutants. Air pollutants will reduce the disease resistance of plants, affect their growth and development, and cause leaf spot or wither and die.

③ Damage to articles. Such as textiles and clothing, leather, metal products, building materials, cultural works of art, etc. , causing chemical damage and pollution damage.

④ Causing acid rain, which has adverse effects on agriculture, forestry and freshwater aquaculture.

⑤ Destroy the upper ozone layer and form an ozone hole, which is harmful to the living environment of human beings and organisms.

⑥ It has an impact on the global climate. For example, the increase of greenhouse gases such as carbon dioxide will lead to the warming of the earth's atmosphere and the increase of global weather disasters. For example, the increase of aerosol particles such as smoke and dust will increase atmospheric turbidity, weaken solar radiation, affect the long-wave radiation of the earth, and may lead to abnormal weather and climate.

How to prevent and control air pollution and reduce its harm and influence has become a major and urgent research topic.

(3) Prevention and control of air pollution

The prevention and control of air pollution is a huge systematic project, which requires the joint efforts of individuals, collectives, countries and even countries all over the world. The following measures can be considered:

(1) Reduce pollutant emissions. Pollution-free energy (such as solar energy, wind energy, hydropower generation), energy structure reform, low-pollution energy (such as natural gas), fuel pretreatment (such as desulfurization before burning coal), and improved combustion technology can all reduce pollutant emissions. In addition, before pollutants enter the atmosphere, some pollutants in waste gas can be eliminated by dust removal and smoke elimination technology, condensation technology, liquid absorption technology and recycling technology, so as to reduce the amount of pollutants entering the atmosphere.

② Control emissions and make full use of the self-purification ability of the atmosphere. Different meteorological conditions have different atmospheric capacity of pollutants, and the same pollutant discharge will cause different pollutant concentrations. For areas and time periods with strong wind, good ventilation, strong turbulence and strong convection, the atmospheric diffusion and dilution ability is strong, and it can accept more areas and time periods where the temperature of factories and mines is reversed. If the atmospheric diffusion and dilution ability is weak, it can't accept more pollutants, otherwise it will cause serious air pollution. Therefore, effective emission control should be carried out in different regions and different time periods.

(3) The site selection, chimney design, urban and industrial planning should be reasonable to avoid excessive concentration of large emitters and repeated pollution, resulting in serious local pollution incidents.

(4) Planting trees to allow more plants to absorb pollutants and reduce the degree of air pollution.