The harm of air pollutants to human body is various, mainly manifested in respiratory diseases and physiological dysfunction, as well as irritation to mucous membranes such as eyes and nose, which is a chronic factor causing asthma in the elderly. Deficiency of lung qi leads to physical decline.
When the concentration of pollutants in the atmosphere is high, it will cause acute pollution poisoning, or aggravate the symptoms, and even kill thousands of people within a few days. In fact, even if the concentration of pollutants in the atmosphere is not high, breathing this polluted air all the year round will cause chronic bronchitis, bronchial asthma, emphysema, lung cancer and other diseases.
In the latest ranking of the causes of death of urban residents in China released by the National Health and Family Planning Commission, malignant tumor death ranks first, among which lung cancer ranks first. The incidence of lung cancer in China is 27% for males and 22% for females.
Causes of air pollution:
The atmosphere is a mixture of nitrogen, oxygen, carbon dioxide, water vapor and solid impurity particles in a certain proportion. As far as dry air is concerned, in terms of volume, in the standard state, nitrogen accounts for 78.08%, oxygen accounts for 20.94%, rare gas accounts for 0.93%, carbon dioxide accounts for 0.03%, and the volume of other gases and impurities is about 0.02%. Various natural changes often cause changes in atmospheric composition.
For example, when a volcano erupts, a large amount of dust, carbon dioxide and other gases are injected into the atmosphere, which causes the volcanic eruption area to be filled with smoke and toxic gases to smoke people; Large-scale forest fires caused by natural causes such as lightning will also increase the content of carbon dioxide and smoke particles.
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