1 What is the most suitable altitude?
Altitude has a great influence on human body. The basic understanding of ordinary people is that the higher the altitude, the smaller the air density, and the more difficult it is for human beings to breathe. And because they are used to normal air pressure, the blood flow will slow down at high altitude and they will feel depressed. And the higher the altitude, the harder it is to cook rice. Some people have nosebleeds.
According to recent reports, people living in plain areas for a long time can only adapt to the reduction of oxygen partial pressure by 20%, and if it exceeds this value, it will cause obvious discomfort. According to the experimental study of physiological health, the altitude most suitable for human survival is 500-2000 meters. The altitude 1500m is a refreshing height.
Altitude 1500m is magical because of "airborne vitamins". It is a natural oxygen bar; This is a romantic paradise, fascinating. At this height, human beings can release the most primitive and authentic romantic passion. In addition, at this height, the dense negative oxygen ions in the air can also strengthen and activate the physiological activities of the human body. The altitude of 1500m is a natural "stimulant".
What are the benefits of the optimal altitude of 1 for people?
The research shows that the mountain climate above 1500m has low oxygen content, strong solar radiation and sufficient ultraviolet rays, which greatly reduces the probability of people suffering from respiratory diseases. Although the daily average temperature at this height is lower than that in the plain, there is little airflow activity. Although there is fog on the mountain, the actual water vapor content is less. Therefore, warm winter and cool summer, less dust and bacteria and fresh air can reduce the infection and occurrence of respiratory diseases.
Through observation, medical scientists have found that after a person climbs a peak of 1 0,500m/hour, physiological changes occur in human body, such as increased lung ventilation and vital capacity, increased peripheral blood circulation, increased cerebral blood flow, increased urine acidity, slightly decreased blood sugar, increased urine ethyl sugar excretion, further improved respiratory function, increased erythrocyte sedimentation rate and increased fibrinogen in blood.
In addition, the altitude of 1500m can also relieve some diseases, such as asthma, chronic bronchitis, scald, atrophic rhinitis, atrophic gastritis, neurodermatitis, neurosis, emphysema, migraine, coronary heart disease, hypertension and so on, and has a certain curative effect on malignant tumors.
1 is the most suitable city for human habitation.
According to statistics, Beijing is 3 1 m above sea level, Shanghai is 4 meters above sea level, Xi 'an is 396 meters above sea level, Chengdu is 505 meters above sea level, Nanning is 72 meters above sea level, Lanzhou is 15 17 meters above sea level, and Yinchuan is11. The snowy holy city of Lhasa, Tibet is 3658 meters.
Other familiar livable cities are Tianjin 3.3m, Nanjing 8.9m, Dalian 92.8m, Hangzhou 4 1.7m, Guangzhou 6.6m, Guilin 162m and Urumqi 9 18m.
However, considering the most suitable altitude for human habitation, apart from various subjective and objective factors, Lanzhou has the most suitable altitude for human habitation.