What is the appropriate indoor humidity in the south?

The country has promulgated the indoor air standard, and the relative humidity is 40%-80% when cooling in summer. When heating in winter, it should be controlled at 30%-60%. The suitable indoor temperature for the elderly and children is 45%-50%; The most suitable indoor temperature for patients with respiratory diseases such as asthma is between 40% and 50%. It is difficult to feel the humidity in detail, so it is recommended to have a hygrometer at home to adjust the indoor humidity at any time.

When the indoor humidity is too high in summer, it will inhibit the heat dissipation of the human body and make people feel very stuffy and irritable. When the indoor humidity is too high in winter, it will make people feel cold, depressed and easy to catch a cold. People are most comfortable living in an environment with relative humidity of 45%-65%.

Humidity is divided into absolute humidity and relative humidity. Absolute humidity refers to the mass of water vapor per cubic meter of air, and relative humidity refers to the degree to which water vapor reaches saturation in air, which is 100%RH. When the absolute humidity is constant, the higher the temperature, the lower the relative humidity. Dew condensation is a phenomenon that when the air humidity reaches a certain saturation level, it condenses on objects with relatively low temperature. Humidity is everywhere, and dew condensation is only a special phenomenon when humidity reaches a certain level.