Humidity is simply the amount of water vapour that is present in the air. The recommended humidity level for dwellings is 45-55%.
Humidity above 60% causes condensation and encourages the growth of mould, fungus, mildew and moisture-based corrosion such as rusting. It also enables bacteria, viruses and dust mites to breed quickly which causes health problems such as allergies, arthritis, asthma and other respiratory health conditions.
If the humidity is too low (typically below below 30%) it causes excess drying which can trigger skin irritations such as a dry nose, eczema and chapped skin. It can also damage possessions, such as wooden furniture, by drying it out too much.
Further Reading
How do I treat black mould in my property? {Jungle Property Knowledgebase article}
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