What are the altitudes of Fuzhou, Nanchang and Changsha respectively? Which cities have altitude sickness and hypoxia? Why?

Fuzhou has an average elevation of 84.0 meters. The average elevation of Nanchang is 22.0 meters. The average elevation of Changsha is 44.9 meters. The average altitude of the above three places is far below the medical definition of altitude sickness standard, and people will not have any hypoxia reaction.

Altitude sickness is a natural physiological reaction after people reach a certain altitude, in order to adapt to the changes of air pressure difference, low oxygen content and dry air caused by altitude. When the altitude reaches about 2700 meters, altitude sickness will occur. Because the oxygen content in the air is reduced at this altitude, people will feel short of breath, dizziness, nausea and so on. However, people who live in the plateau for a long time will have the phenomenon of red blood cell proliferation, so there will be no symptoms.

The areas above 2,700 meters above sea level in China are: Qaidam Basin is the highest inland mountain basin in China, with an average elevation of 2,700 to 3,500 meters. Shigatse is located at the intersection of Nianchu River and Yarlung Zangbo River, more than 250 kilometers west of Lhasa, with an altitude of 3,800 meters. Daocheng is 3700 meters above sea level. Batang is 2900 meters above sea level. Ranwu is 3850 meters above sea level. Lhasa is 3650 meters above sea level.