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Health and Relative Humidity of Air

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Relative humidity (RH) should be within certain limits for control of the health aspect.

  • Bacteri : 20 - 70% RH
  • Viruses : 40 - 80% RH
  • Fungi : 0 - 70% RH
  • Mites : 0 - 60% RH
  • Respiratory infections : 40 - 50% RH
  • Allergic Rhinitis and Asthma : 40 - 60% RH
  • Chemical interactions : 0 - 40% RH
  • Ozone production : 75 - 100% RH
  • Combined Health Conditions : 40 - 60% RH

In general - relative humidity for human comfort ranges 30 - 60% RH.

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Related Topics


Human physiology vs. air quality, comfort temperatures, activity and metabolic rates. Health effects of gases adn polutions like carbon monoxide and more.

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Absolute humidity is the actual mass of water vapor present in the air water vapor mixture.

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Indoor Relative Humidity vs. Outdoor Relative Humidity and Temperature

Recommended indoor relative humidity vs. outdoor relative humidity and temperature.

Moist Air - Relative Humidity

Relative humidity in moist air is the ratio of partial vapor pressure to air pressure.

Relative Humidity in Production and Process Environments

Recommended relative humidity in production and process environments - like libraries, breweries, storages and more.

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