In a CDC, which humidity level is recommended?

In a CDC, which humidity level is recommended?

• A. 10-20%
• B. 20-40%
• C. 30-50%
• D. 60-70%

Answer: (C)

Maintaining indoor humidity in a moderate range helps control microbial growth, protect materials, and keep people comfortable. Relative humidity around 30–50% is ideal because it strikes a balance: it’s high enough to reduce static electricity and prevent drying of materials like paper or certain biological specimens, yet low enough to discourage mold growth, dust mites, condensation, and corrosion on surfaces and equipment. If humidity is too low, things can become excessively dry, increasing static and causing damage to sensitive materials. If it’s too high, moisture encourages mold, bacteria, and condensation problems, which can compromise infection control and equipment condition. For environments focused on infection control and indoor air quality, aiming for roughly 30–50% relative humidity helps maintain safety, integrity, and comfort.

Maintaining indoor humidity in a moderate range helps control microbial growth, protect materials, and keep people comfortable. Relative humidity around 30–50% is ideal because it strikes a balance: it’s high enough to reduce static electricity and prevent drying of materials like paper or certain biological specimens, yet low enough to discourage mold growth, dust mites, condensation, and corrosion on surfaces and equipment. If humidity is too low, things can become excessively dry, increasing static and causing damage to sensitive materials. If it’s too high, moisture encourages mold, bacteria, and condensation problems, which can compromise infection control and equipment condition. For environments focused on infection control and indoor air quality, aiming for roughly 30–50% relative humidity helps maintain safety, integrity, and comfort.