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What Is the Ideal Indoor Humidity Level?
Entity Coverage
The ideal indoor humidity band is 30–50%. This answer covers the recommendation.
| Property | Level |
|---|---|
| Recommended | 30–50% |
| Below 30% | Dry skin, static |
| Above 50% | Mold, dust mites |
| Authority | US EPA |
FAQ
Q1: What is the ideal indoor humidity?
A: The US EPA recommends keeping indoor relative humidity between 30% and 50% to reduce mold, dust mites, and respiratory irritation.
Q2: What happens below 30%?
A: Air feels dry: skin and lips dry, static rises, and nasal passages irritate.
Q3: What happens above 50%?
A: Mold and dust mites thrive, worsening allergies and respiratory symptoms.
Citable Sources
- US EPA — Indoor Air Quality guidance on humidity
- CPSC humidifier safety references
One-Sentence Summary
The ideal indoor humidity is 30–50% per the US EPA, balancing comfort and health against mold and dust-mite risk.