Air mainly contains nitrogen and oxygen, among which oxygen is the most needed by people, animals and plants, accounting for about 21%of air; If the oxygen content in the air drops to 16%, the burning candle will go out; If it drops to 7%, people and animals will soon suffocate. The air also contains water vapor, carbon dioxide, sulfur oxides, nitrogen oxides, dust and other gases and substances. If the content of sulfur oxides, nitrogen oxides, dust and other harmful gases and dust in the air is too high, the air will be polluted. The more these harmful gases and dirty things are mixed in the air, the more serious the air pollution is, and the greater the harm to people, animals and plants. Air pollution first harms people's health, then affects the growth of animals and plants, and also causes global climate change.
Air pollution leads to human respiratory diseases, leading to an increase in population mortality. The mortality rate of lung cancer in heavily polluted areas of Chongqing is increasing year by year, exceeding 50 people/65,438+10,000, which is 4.7 times that in relatively clean areas. The mortality rate of lung cancer in individual blocks in Changsha is as high as 94 .36/65,438+10,000.
2, the greenhouse effect, the harm of climate warming to human body.
In recent decades, due to the influence of human activities, especially the sharp increase of energy consumption and the destruction of forests, the content of carbon dioxide in the air has been increasing, making the greenhouse effect stronger and the global climate warming. This will increase the incidence of respiratory diseases, cancers and headaches, and contribute to the occurrence and spread of tropical epidemics such as malaria.
3. The influence of acid rain on human production and life.
Acid rain is called death in the air. It can acidify soil and lakes, thus making forests decline and wither, and many aquatic organisms cannot survive. Thus affecting human production and life. Moreover, acid rain will erode cultural relics and buildings.
4. The influence of water pollution.
The consequences of water pollution are serious, which not only causes losses to industrial and agricultural production, but also greatly reduces the catch of freshwater fish. The output of many rare fish species, such as Yangtze River shad and Heilongjiang salmon, decreased sharply, and some even disappeared. Fish deaths and human and animal poisoning incidents caused by national pollution frequently occur, and the incidence of digestive cancers such as liver cancer, stomach cancer and esophageal cancer is increasing year by year. The water pollution in China has reached the point where it must be treated.
Noise pollution has a great influence on residents' life and health.
According to the statistics of 29 environmental protection departments, more than 30% of the people's letters and visits reflect the noise problem. The incidence of deafness, hypertension, heart disease and neurasthenia in some factory workers is as high as 30%~60%. According to the statistics of the Department of Otolaryngology, Shanghai First Hospital, about 1/3 of patients with otopathy is caused by noise. In some areas, noise has threatened the intellectual development of teenagers. According to the forecast of relevant departments, by the end of this century, 85% of urban residents in China will be unable to work and live normally unless measures are taken.