The importance of humidity for human health

Text: Magnus Attefall
Audience: Airline passengers, journalists, and decision-makers in the aviation industry

Introduction:
This piece demonstrates how I bring together scientific research, technical data, and messaging strategy to tell a broader story about well-being and climate. It reflects my ability to make complex health-related topics both accessible and meaningful for aviation and indoor climate audiences.

Join us as we explore the fascinating science behind humidity and its powerful impact on human health. From academic research to real-world airline experiences, discover why the air you breathe—especially at 35,000 feet—matters more than you think.

High altitude, low humidity: What global studies reveal

Picture yourself on a long-haul flight from New York to Beijing. Did you know that the ultra-dry cabin air can lead to dry skin, fatigue, and dehydration? Studies from Tsinghua University and the University of Melbourne confirm that low humidity in aircraft cabins directly affects passenger comfort and well-being.

It was proved that a 1 percent decrease in relative humidity was associated with a 7-8 percent increase in cases of COVID-19 infections.

Michael P. Ward, Shuang Xiao,
Zhijie Zhang University of Sydney and Fudan University

The Swedish perspective: Insights from leading universities

Research from Uppsala University shows that humidified cabin air significantly improves air quality perception among airline crew. Meanwhile, experts from Lund University have established a clear link between cabin humidity and a stronger immune system, highlighting the health benefits of maintaining proper moisture levels in the air.

Humidity and viruses: A new frontline in health protection

Humidity isn’t just about comfort—it’s a powerful ally in the fight against airborne viruses. The University of Sydney found that humidity plays a key role in controlling the transmission of viruses like SARS-CoV-2. The University of Minnesota and University of Colorado Boulder add that higher humidity can reduce the lifespan of viruses, making humidification a smart strategy for safer air travel.

The fact that many respiratory virus infections have a seasonal pattern – where they are much more common during winter – depends partly on the low humidity in the air during those months.

Professor Bertil Forsberg, Umeå University

Humidity influences mood and sleep quality

Did you know that the right humidity levels can lower stress and improve sleep? Research from Javad Razjouyan and his team reveals that higher humidity in office environments leads to less stress and better rest. Now imagine the benefits for pilots, crews, and passengers—especially when cabin humidity in flight decks and crew rest areas can be as low as 0-3%, and only 3-12% in passenger cabins.

The immune connection: Protecting your health

Andrea Vianello from the University of Padova emphasizes that controlling relative humidity is essential for preventing the spread of viruses and bacteria. Proper humidity isn’t just a comfort feature—it’s a vital part of a healthy travel environment.

Dry air, as in the aircraft cabin environment with RH dropping down to 5 to 20 percent, therefore increases the risk of exposure to viable virus particles and other airborne pollution – and consequently, infectious diseases.

Professor Magnus Svartengren, Uppsala University

Humidity is essential for your health, especially when flying

From the buildings we live into the airplanes we travel on, humidity plays a crucial role in our well-being. The next time you notice dry air in an aircraft, remember: it’s not just about comfort; it’s about your health.

Choose to fly with CTT Systems Humidifier Onboard and experience a healthier, more comfortable journey. Put your well-being first and enjoy the benefits of optimal cabin humidity every time you travel.

Welcome onboard a comfortable and healthy flight
– with CTT Systems Humidifier Onboard