What is the normal air humidity?

As long as it is not lower than 5%RH (relative humidity) or higher than 95%RH, the general human body can bear it well.

The main impact on human health is that people are exposed to low temperature and high humidity for a long time, which is prone to some joint diseases and skin diseases. Other environments will not have much impact on health.

It is not advisable to wait in a place with high humidity for a long time, because it is easy to suffer from arthritis and other diseases in this environment for a long time. Long-term low humidity environment will make the skin rough and cracked, but it will not cause serious diseases. But from the perspective of human feeling, it is related to temperature. The following may make you feel comfortable.

① When the temperature is below 0℃ ~8℃, the atmospheric humidity is relatively low, and 20%RH~50%RH is appropriate, which will make you feel not too cold, but your skin will easily lose water. If the humidity is high, you will feel gloomy and cold.

②8℃~28℃, as long as 30%~80% is acceptable to human body. The relative humidity is about 50%. When the humidity is low, I feel dry; When the humidity is too high, I feel wet.

(3) Above 28℃, the humidity decreases with the increase of air temperature, which is beneficial for human body to sweat and dissipate heat. If the humidity is too low, it will dry, and the skin will be dehydrated and rough soon. When the humidity is too high, it will make people feel sultry and difficult to sweat.

Physiologists believe that when the indoor temperature is too high, it will affect people's body temperature regulation function. In winter, if the indoor temperature is always above 23 degrees Celsius, people will be exhausted and dizzy. At the same time, due to the large temperature difference between indoor and outdoor, it is difficult for human body to adapt and it is easy to catch a cold. If the indoor temperature is too low, it will reduce the metabolic function of human body, slow down the pulse and breathing, weaken the resistance of respiratory mucosa, and easily induce respiratory diseases. Pay attention to indoor humidity and indoor temperature adjustment. In summer, the indoor humidity is too high, which will inhibit the heat dissipation of the human body and make people feel very stuffy and irritable. In winter, indoor humidity is high, which makes people feel cold, depressed and easy to catch a cold. The most pleasant indoor temperature and humidity are: winter temperature 18℃ to 25℃, humidity 30% to 80%; In summer, the temperature is 23℃ to 28℃ and the humidity is 30% to 60%.