The relative humidity in rooms apparently plays an important role in the spread of the new coronavirus SARS-CoV-2. Researchers from India and Germany are recommending therefore, in addition to the previously customary measures such as spacing and masks, the room air should also be controlled so that the air humidity does not fall below 40 percent.
Tilo Arnhold, TROPOS
Indian-German research team recommends at least 40 percent humidity in public buildings
Transmission of the coronavirus SARS-CoV-2 via aerosol particles in indoor environment seems to be strongly influenced by relative humidity. This is the conclusion drawn by researchers from the Leibniz Institute for Tropospheric Research (TROPOS) in Leipzig and the CSIR National Physical Laboratory in New Delhi from the analysis of 10 most relevant international studies on the subject. Therefore, they recommend controlling the indoor air in addition to the usual measures such as social distancing and masks. A relative humidity of 40 to 60 percent could reduce the spread of the viruses and their absorption through the nasal mucous membrane. To contain the COVID-19 pandemic, it is therefore extremely important to implement standards for indoor air humidity in rooms with many people, such as hospitals, open-plan offices or public transport, writes the research team in the scientific journal Aerosol and Air Quality Research.
According to the WHO, the coronavirus SARS-CoV-2 has led to at least 21 million infected persons and over 750,000 deaths worldwide in over half a year. The health and economic effects of the pandemic pose major social challenges for practically all countries. Worldwide, therefore, ways are being sought to stem the spread of the virus in order to avoid drastic measures such as lockdowns and contact restrictions. For a long time, the main transmission route of viral droplets was considered to be direct human-to-human contact, because of infected people sneezing or coughing and secreting the virus. Because these drops are relatively large and heavy, they fall very quickly to the ground and can only cover very short distances in the air. The recommendation to keep a minimum distance of 1.5m to 2m (social distancing) is based on this assumption. Recently, however, COVID-19 outbreaks have also been recorded, which seem to be due to the simultaneous presence of many people in one room (choir rehearsals, slaughterhouses, etc.). A safety distance of 1.5m is apparently not sufficient when infected and healthy people are together in one room for a long time. For example, Dutch researchers have now been able to prove that tiny drops of 5 micrometres in diameter, such as those produced when speaking, can float in the air for up to 9 minutes. In July, 239 scientists from 32 countries – including the chemist Prof. Hartmut Herrmann from TROPOS – therefore appealed to the World Health Organization (WHO) to focus more closely on the long-lived infectious particles suspended in the air. In order to contain the spread via the aerosol particles floating in the air, the researchers recommend not only continuing to wear masks but also, and above all, good indoor ventilation.
An Indo-German research team is now pointing out another aspect that has received little attention so far and could become particularly important in the next flu season: Indoor humidity. Physicists at the Leibniz Institute for Tropospheric Research (TROPOS) in Leipzig and the CSIR National Physical Laboratory in New Delhi have been studying the physical properties of aerosol particles for years in order to better estimate their effects on air quality or cloud formation. “In aerosol research, it has long been known that air humidity plays a major role: The more humid the air is, the more water adheres to the particles and so they can grow faster. So, we were curious: what studies have already been conducted on this,” explains Dr. Ajit Ahlawat from TROPOS.
Therefore, they evaluated a total of 10 most relevant international studies between 2007 and 2020 by other researchers who investigated the influence of humidity on survival, spread and infection with the pathogens of influenza and the corona viruses SARS-CoV-1, MERS and SARS-CoV-2. Result: Air humidity influences the spread of corona viruses indoors in three different ways: (a) the behaviour of microorganisms within the virus droplets, (b) the survival or inactivation of the virus on the surfaces, and (c) the role of dry indoor air in the airborne transmission of viruses. Although, low humidity causes the droplets containing viruses to dry out more quickly, the survivability of the viruses still seems to remain high. The team concludes that other processes are more important for infection: “If the relative humidity of indoor air is below 40 percent, the particles emitted by infected people absorb less water, remain lighter, fly further through the room and are more likely to be inhaled by healthy people. In addition, dry air also makes the mucous membranes in our noses dry and more permeable to viruses,” summarizes Dr. Ajit Ahlawat.
The new findings are particularly important for the upcoming winter season in the northern hemisphere, when millions of people will be staying in heated rooms. “Heating the fresh air also ensures that it dries. In cold and temperate climate zones, therefore, the indoor climate is usually very dry during the heating season. This could encourage the spread of corona viruses,” warns Prof. Alfred Wiedensohler of TROPOS. The air humidity determines how much water a particle can bind. At higher air humidity, the surface of the particles changes considerably: a kind of water bubble forms – a miniature ecosystem with chemical reactions. The liquid water content of aerosols plays an important role in many processes in the atmosphere, as it influences the optical properties, leading for example to haze or altered effects of aerosols on the climate.
At a higher humidity, the droplets grow faster, fall to the ground earlier and can be inhaled less by healthy people. “A humidity level of at least 40 percent in public buildings and local transport would therefore not only reduce the effects of COVID-19, but also of other viral diseases such as seasonal flu. Authorities should include the humidity factor in future indoor guidelines,” demands Dr. Sumit Kumar Mishra of CSIR – National Physical Laboratory in New Delhi. For countries in cool climates, the researchers recommend a minimum indoor humidity. Countries in tropical and hot climates, on the other hand, should take care that indoor rooms are not extremely undercooled by air conditioning systems. When air is extremely cooled, it dries out the air and the particles in it, making people inside the room feel comfortable. But the dry particles will remain in the air for longer duration.
From a researchers’ point of view, more attention should be paid to indoor air to prevent future outbreaks of viral disease. The moisture content of indoor air is an important aspect but not the only one. Fresh air from outside can also reduce the risk of transmission. And of course, the measures already known and practised: Keep social distancing, having as few people per room volume as possible, and wearing masks. The lowest risk of infection still where there are no viruses in the air.
The Latest Updates from Bing News & Google News
Go deeper with Bing News on:
Transmission of the coronavirus SARS-CoV-2
- Vaccination after SARS-CoV-2 infection linked to a decrease in long COVID symptoms
CoV-2, the virus responsible for COVID-19, is associated with a decrease in the likelihood of long COVID symptoms, finds a large study of UK adults published by The BMJ today.
- Audio Interview: What to Make of Covid-19 Hot Spots
The continuing spread of SARS-CoV-2 remains a Public Health Emergency of International Concern. What physicians need to know about transmission, diagnosis, and treatment of Covid-19 is the subject of ...
- Scientists explore triggers associated with transplacental transmission of SARS-CoV-2
A new study examines the risk of fetal SARS-CoV-2 infection following infection of a pregnant mother with the virus.
- Evolution of SARS-CoV-2 variants of concern
In a recent study posted to the bioRxiv* preprint server, researchers investigated the evolution of different severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern (VOCs). .
- Vaccination boosted immunity acquired from previous SARS-CoV-2 infection
Two doses of the Pfizer-BioNTech BNT162b2 vaccine were linked to high immediate protection again severe acute respiratory syndrome coronary virus 2 (SARS-CoV02) infection, which waned after 6 months ...
Go deeper with Google Headlines on:
Transmission of the coronavirus SARS-CoV-2
Go deeper with Bing News on:
- "Mother of all variants" could keep COVID-19 in the driver seat
It might feel like COVID-19 is in the backseat, but some troubling developments in the States suggest the mother of all variants is looming.
- LA County enters ‘medium’ coronavirus risk level as case numbers rise
After residents enjoyed weeks of relaxed masking and the return of large in-person events such as music festivals County on Thursday, May 19, moved from a “low” community transmission level to a ...
- Honolulu, Maui counties join Kauai as high-level communities of COVID-19 transmission
The U.S. Centers for Disease Control and Prevention has moved Honolulu and Maui counties from the yellow, medium-risk community level to the red, high-risk community level for COVID-19.
- More Minnesota counties have high COVID-19 levels, but milder cases
Coronavirus infections appear to be rising beyond publicly reported levels in Minnesota, but the latest pandemic wave has caused milder illnesses and modest increases so far in COVID-19 ...
- DHEC encourages residents to monitor COVID-19 stats amid rise in cases
Cases of COVID-19 are on the rise again across South Carolina, and the state's top health agency is urging everyone to stay safe.