[Altitude below 2500 meters] Little impact on human body;

[2500～3000 meters above sea level] Breathing and heartbeat speed up slightly, a very small number of people have mild altitude sickness, which disappears quickly;

[Altitude 3000～3500 meters] Mild altitude sickness, such as rapid breathing and heartbeat, fatigue, headache, sleep disturbance, etc. There is a chance of high altitude pulmonary edema and other respiratory diseases and other altitude sicknesses;

【3500～4000 meters above sea level】 Some people have strong altitude sickness, such as shortness of breath, chest tightness, headache, tinnitus, vomiting, etc. Increased chance of altitude sickness;

[Elevation 4000～4500 meters] Most people appear in different altitudes.

Ordinary people working or living on the plateau often cause discomfort due to lack of oxygen. According to survey statistics, 3000 meters above sea level is the critical altitude, and people with less than 3000 meters above sea level have less adverse symptoms; the climate characteristics above 3000 meters above sea level are very different from those in plain lowlands. As the altitude increases, more than 60% of people will be different. The degree of discomfort, hypoxia, or disease. The various symptoms that occur due to high altitude hypoxia are medically called inadequacy, commonly known as altitude sickness. Individuals have different adaptability to the plateau, and the altitude sickness is also different. Some are temporary. As long as they adapt to the plateau environment for a period of time, they will return to normal, and some last longer or the altitude sickness is very strong.