The so-called air pollution refers to the amount, nature and time of one or more pollutants contained in the air, which will harm the lives of human beings, plants and animals, damage property, or interfere with the comfortable living environment, such as the existence of odor. In other words, as long as the amount, nature and time of a substance are enough to affect human beings or other organisms or property, we can call it an air pollutant; and the phenomenon caused by its existence is air pollution.
The main components of polluted air are harmful gases and dust. Harmful gases are mainly carbon oxide, sulfur dioxide, nitrogen dioxide and other gases. Powder seat mainly refers to some small solid particles, their sources:
Sulfur dioxide mainly comes from the combustion of fuels such as coal and oil, and the exhaust gas emitted by factories. Carbon monoxide mainly comes from the incomplete combustion of fossil fuels and the exhaust gas of automobiles. Nitoxide mainly comes from
Exhaust gases and fireworks and firecrackers emitted by motor vehicles are mainly dust, coal-fired dust, sandstorms, etc. The measures to prevent air pollution mainly include: industrial waste gas is discharged after treatment, reducing dependence on fossil fuels, researching and promoting the use of clean energy, planting a large number of trees, and prohibiting combustion. Fireworks and firecrackers, etc.
Air pollution sources can be divided into two categories: natural and man-made. Natural pollution sources are formed due to natural causes, such as volcanic eruptions, forest fires. Man-made pollution sources are formed due to people's production and living activities.
There are three main sources of air pollution.The first is industrial enterprises, which are the main source of air pollution and one of the key points of air health protection. With the rapid development of industry, the types and quantities of air pollutants are increasing day by day.Due to the different nature, scale, technological process, raw materials and product types of industrial enterprises, the degree of air pollution is also different.
The second is the living stove and heating boiler, in the residential area, 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 the winter heating time, often make the polluted area is full of smog, which is also a source of air pollution that can not be ignored.
The third is transportation. In recent decades, due to the development of transportation, the number of cars in cities has increased, and the frequent transportation of passengers and goods such as trains, ships, and airplanes has added new sources of air pollution to cities.
Nowadays，Air pollution has become an inescapable reality in the lives of city dwellers around the world.The greenhouse effect, acid rain, and ozone layer depletion are environmental effects derived from air pollution. It also causes great harm to human health, industrial and agricultural production, utensils and materials, animal and plant growth, social property and the global environment.
Polluted atmosphere enters the human body and can lead to respiratory, cardiovascular, neurological or other diseases.When the atmosphere is heavily polluted, animals can be poisoned or killed by inhaling harmful substances.However, the harm to animals from air pollution is often due to the fact that they consume or drink plants and water that have accumulated atmospheric pollutants.The harm to plants is due to the physiological and biochemical changes that pollutants cause to the plant body.The risk to plants is due to the fact that pollutants cause physiological and biochemical changes in the plant body.
Particulate matter reduces atmospheric visibility and reduces the amount of sunlight radiation reaching the ground. Especially in large industrial cities, when the smoke does not disperse, daylight is 40% less than normal. Pollutants such as nitrogen oxides, hydrocarbons and HCFCs in the upper atmosphere have greatly decompose ozone, and the "ozone hole^ problem" has become the focus of global attention.
It can be seen that with the continuous increase of the number of harmful substances, air pollution will not only adversely affect the production of goods and materials, but also endanger the healthy growth of human beings, animals and plants. There are also many causes of air pollution, which account for the vast majority of human causes, such as industrial exhaust, burning garbage, automobile exhaust emissions, nuclear explosions, etc. Unhesitatingly
Human beings have realized such a problem and have taken certain remedial measures, but the effect is not very obvious. Therefore, as a member of the earth, we should start from ourselves, do not do anything harmful to the environment, and make our only living environment better.
