The degree of dryness and humidity of the air is called "humidity". The less water vapor is contained in a certain volume of air at a certain temperature, the more dry the air; the more water vapor, the more humid the air. In the summer season, we open air conditioners for a long time in a closed environment. The indoor dry humidity seriously affects the health of each of us.

1200 - 2000 Puffs (included)

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