What is the indoor humidity standard?

The human body feels most comfortable in the environment with relative humidity of 45% ~ 65% RH. During the heating period in winter, the indoor humidity is usually only 65438±05% RH. You can use a humidifier at home or mop the floor with a wet mop, or put a basin on the heater. Keeping two pots of daffodils indoors can adjust the relative humidity and make the room full of fragrance.