The degree of dryness and wetness of air is called "humidity". At a certain temperature, the less water vapor in a certain volume of air, the drier the air; The more water vapor, the wetter the air. Turn on the air conditioner in a closed environment for a long time in summer, and the indoor dryness and humidity seriously affect everyone's health.

Today, I will bring you the health index of indoor air dryness and humidity to see which humidity index is most beneficial to human health. Interested friends may wish to take a look together.

The research also shows that when the relative humidity is more than 90% and the temperature is 26℃

It will make people feel 3 1℃. Dry air absorbs sweat at the same speed as human sweat glands produce sweat, which makes us feel cool. However, the air with high humidity is full of water and can no longer absorb water, so sweat has to accumulate on our skin, which makes our body temperature rise continuously and our heart overwhelmed.

Modern medical meteorological research shows that the suitable relative humidity of human body is: when the room temperature is 25℃ in summer, the relative humidity is controlled at

40%-50% is more comfortable; When the room temperature is 65438 08℃ in winter, the relative humidity is controlled at 60%-70%. In the dog days of summer, due to the effect of high temperature, low pressure and high humidity, sweat is not easy to be discharged and evaporated after sweating, which will make people fidgety, tired and lose appetite. Sometimes the humidity is too low and the air is too dry in winter, which is easy to cause upper respiratory tract mucosal infection and cold. According to scientific experiments, when the daily variation of temperature is greater than 3℃, air pressure is greater than 10 hectopascal, and relative humidity is greater than 10%, the incidence of arthritis will increase significantly.

Excessive humidity: the amount of pineal hormone in human body is also large, which makes the concentration of thyroxine and adrenaline in the body relatively lower, so that cells will be "lazy" and people will feel listless and depressed. Working and living in places with high humidity for a long time (such as mountains and islands) is also prone to rheumatism, rheumatoid arthritis and other damp arthralgia.

Humidity is too small: evaporation is accelerated, and dry air is easy to take away water from human body, which makes people's skin chapped, mouth and nasal mucosa stimulated, and symptoms such as thirst, dry cough, hoarseness and sore throat appear. Therefore, when dry cold air invades in autumn and winter, it is easy to induce diseases such as pharyngitis, tracheitis and pneumonia.