What is the normal humidity?

According to the requirements of national indoor air quality standards, the environment with indoor air humidity of 30% ~ 60% and humidity index of 50% ~ 60% in winter is the most comfortable.

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 obviously.

In medicine, the relationship between air humidity and breathing is very close. Under certain humidity, oxygen can easily enter the blood through alveoli. The average person feels most comfortable at 45-55% relative humidity. The relative humidity of overheated and unventilated rooms is generally low, which may be harmful to the skin and irritating to the mucosa.

Extended data:

1. The standard of disastrous weather in China is that the highest temperature in the south of the Yangtze River is higher than 40℃, or the highest temperature reaches 35℃ and the relative humidity is higher than 60%; The highest temperature in the area north of the Yangtze River is 35℃, or 30℃, and the relative humidity is above 65%.

2. Air humidity is a meteorological factor indicating the water vapor content and humidity in the air. Ground air humidity refers to the air humidity at the height specified by ground meteorological observation (i.e.1.25 ~ 2.00m, and1.5m in China).

3. Relative humidity is an important index to measure the indoor thermal environment of a building. Architectural physics defines that when human subjective thermal sensation is neutral, the wind speed is not more than 0. 15m/s and the relative humidity is 50%, which is also a benchmark for indoor thermal environment design.

References:

Baidu encyclopedia-humidity