How much humidity is normal?

50% weather relative humidity is the most comfortable and reasonable indoor environment.

Relative humidity is an important index to measure the indoor thermal environment of a building. When the subjective thermal sensation of human body 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.

Modern medical meteorological research shows that the suitable relative humidity of human body is: when the room temperature is 25℃ in summer, it is more comfortable to control the relative humidity at 40%-50%; When the room temperature is 20℃ in winter, the relative humidity is controlled at 60%-70%.