by 
The Curious Bag
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<h4 class="dechead">On One Hand: Moisture Is Good for the Body
The humidity levels in your home should ideally be between 30 and 40 percent as measured by a hygrometer. According to a 1991 US Environmental Protection Agency report on home humidifiers, humidity is important to maintain good health by keeping the skin, nasal passages and throat lubricated. Run your humidifier as long as it takes to reach this percentage range for optimal health benefits.
On the Other: Too Much Moisture Can Cause Problems
If you run your humidifier too long and the levels of humidity reach 50 percent or above in your home, you risk exposing your family to mold spores and other microorganisms that spread in humid conditions. This can be a problem for the elderly, young children, and others with compromised immune systems.
Bottom Line
Use your humidifier when the moisture levels in your home fall below the recommended 30 to 40 percent range to reach the desired range. Run your humidifier only as long as it takes to reach optimal humidity or an increase in harmful microorganisms can result in your home.
Source:
United States Environmental Protection Agency - Use and Care of Home Humidifiers
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