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Hello world!

Posted on March 19, 2020

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Take Action! Sign the Petition

Dear Director General WHO,

I call on the World Health Organization to

Review the scientific evidence related to indoor humidity and respiratory immune system response, viral transmission and virus inactivation.
Produce guidelines on the minimum lower limit of indoor humidity in public buildings for health.

Petition update

Thanks to your support, we have managed to raise the awareness of this issue on a global stage.

When asked in a press conference, the WHO’s Technical Lead for COVID-19, Dr Maria Van Kerkhove, said that the WHO were aware of this petition and have now put forward guidelines covering indoor humidity levels, in association with their scientific partners.

Dr Van Kerkhove specifically referenced an “ideal relative humidity of between 50 and 60%” and referred to their partner, the Global Heat Health Information Network, which in association with the WHO has published a recommendation to avoid low humidity below 40%RH on its website here.

Watch the WHO press conference here:

Take Action! Sign the Petition

Read the Petition

Dear Director General WHO,

I call on the World Health Organization to

Review the scientific evidence related to indoor humidity and respiratory immune system response, viral transmission and virus inactivation.
Produce guidelines on the minimum lower limit of indoor humidity in public buildings for health.

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Seasonality of Respiratory Viral Infections – Moriyama et at 2020

2019 Novel Coronavirus (COVID-19) Pandemic: Built Environment Considerations To Reduce Transmission – Dietz et al 2020

Low ambient humidity impairs barrier function and innate resistance against influenza infection – Kudo et al 2019

High Humidity Leads to Loss of Infectious Influenza Virus from Simulated Coughs – Noti et al 2013

Indirect health effects of relative humidity in indoor environments – Arundel et al 1986

Relationship between Humidity and Influenza A Viability in Droplets and Implications for Influenza’s Seasonality – Yang et al 2012

Factors that affect respiratory virus transmission. Seasonal environmental factors modulate host airway immune responses and affect viability and transmission ways of respiratory viruses. Human behavior affects the contact rates between infected and susceptible individuals. Abbreviations: AH, absolute humidity; MCC, mucociliary clearance; RH, relative humidity.

Extract from Annual Review of Virology, Seasonality of Respiratory Viral Infections, Moriyama et al 2020.

Why humidify? The Sterling Chart

Optimum Relative Humidity for Health. Download PDF

Pathogens 101 How These Tiny Threats Thrive

Learn how these tiny threats thrive and spread to the next person, and why your relative humidity and temperature decisions matter. Download PDF

Why humidify? For Hospitals & Healthcare

Improve patient experience and maximize revenue with balanced air hydration. Download PDF

Why humidify? For Offices & Workplaces

Establishing balanced relative humidity (RH) is essential to occupant health and wellness in addition to maintaining peak efficiency. Download PDF

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Watch the WHO press conference below: