Why balanced air humidity is an
important building block for your health

Humid air kills germs

Within the optimum range of 40 to 60% of relative air humidity, aerosols shrink only so far that the salt concentration in the aerosol core increases so much that the germs and microorganisms they contain are killed off.

Our immune system works best with the right air humidity.

Excessively dry air also damages the sophisticated protective mechanism of the respiratory tract. The mucous layer dries up, becomes tough and obstructs the movements of the cilia, so that viruses and germs can no longer be removed.

Why is sneezing contagious?

In dry air in particular, germ droplets spread over long distances and remain contagious for long periods of time. The situation is different with optimal air humidity between 40 and 60 percent.

In this range, the germ droplets do not travel long distances and they infect fewer people. Thus, optimal ambient air humidity provides effective protection against infection.

Why is an air humidity of 40 to 60% optimal?

Scofield Diagram
A relative air humidity of 40–60% is optimal for the human body. This area is very unfavorable for germs, fungi and bacteria, which means that the air poses hardly any strain for humans. The risk of contracting flu and cold viruses is minimal in this range.

Humid air minimizes the danger of germ droplets

Humidity has a major impact on the infectivity of germ droplets. At intermediate humidity levels, the risk of infection is minimal and increases rapidly with dry room air.
Humid Air
At an ambient air humidity of 7 - 23 % RH the Infectivity of entered germs after 60 minutes is 77%
At a room humidity of 43 % RH the infectivity of entered germs after 60 minutes is minimal at 15%.
Study: high humidity
Source: Study: “High humidity leads to loss of infectious influenza virus from simulated coughs”, by Dr. John D. Noti