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According to some studies, air humidity around 50 percent is best because it doesn't cause bacteria to multiply, and it minimizes the chance of flu virus survival.

Use a dehumidifier when the air humidity is greater than 50% to reduce the surrounding moisture content.Dehumidifiers relieve allergies by removing mold, dust mites and mildew from the air.
Use a humidifier when the air humidity is less than 35 percent or the house is dry in the winter. This can help relieve dry skin and nasal discomfort.
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