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Studies show that new types of UV light make indoor air as safe as outdoors

According to new research A new type of UV light, led by Columbia University, is safe for people. It took less than 5 minutes to reduce the levels of microorganisms in the indoor air by more than 98%.

This study was published in the journal “Scientific Reports”.

Disinfecting indoor air with far UV light is a new approach to safely and efficiently destroying viruses in the air in an occupied space.

This study could show that far-UV C light from a ceiling-mounted lamp is a highly effective passive technology to reduce the transmission of airborne infectious diseases and reduce the risk of the next pandemic. It suggests that there is.

“Far-UVC rapidly reduces the number of active microorganisms in the room air to near zero, making the room air essentially as safe as the outside air,” he said. David BrennerPhD, Director of Radiation Research Center, Columbia University Bageros Medical University, and co-author of the study.

“Using this technology in places where people gather indoors can prevent the next potential pandemic,” he added.

“Far-UVC Lights are easy to install, cheap, and do not require any change in behavior. Above all, they are a safe way to prevent the transmission of viruses, including the COVID virus and its variants. As an influenza and future pandemic virus. There is also the possibility of this. “

For decades, scientists have known that a type of UV light known as UVC light kills microorganisms, including bacteria and viruses, rapidly. However, traditional bactericidal UVC lights cannot be used directly to destroy airborne viruses in occupied indoor spaces, as they can be harmful to the skin and eyes.

About 10 years ago, Columbia University scientists said that another type of UVC light, known as distant UVC light, is as efficient as destroying bacteria and viruses, but the safety of traditional bactericidal UVCs. Proposed that there is no concern.

Far UVC light is safer for people because it has a shorter wavelength than traditional bactericidal UVC and cannot penetrate living human skin and eye cells. However, it is just as efficient at killing bacteria and viruses that are much smaller than human cells.

Over the last decade, many studies around the world have shown that far-UVC is efficient in destroying bacteria and viruses in the air and can be safely used around people. However, until now, these studies have only been conducted in small laboratories, not in full-scale rooms that mimic real-world conditions.

In the current study, scientists from the University of St Andrews, the University of Dundee, the University of Leeds, and Columbia University tested the effectiveness of distant UVC lights in large room-sized chambers with the same ventilation as a typical home. Office (air exchange about 3 times an hour).

During the experiment, the sprayer continuously released Staphylococcus aureus aerosol mist into the room. (This microorganism is slightly less sensitive to far UVC light than the coronavirus and was selected to provide researchers with a properly conservative model.) When the concentration of microorganisms in the room stabilizes, the researchers Turned on a commercial overhead far UVC lamp. ..

With the intensity set by the American Conference of Governmental Industrial Health based on current regulatory restrictions on light exposure to distant UVCs, distant UVC lamps inactivated more than 98% of airborne microorganisms in just 5 minutes. Low levels of viable microorganisms were maintained over time, even if the microorganisms continued to be sprayed into the room.

The effectiveness of various approaches to reducing indoor virus levels is usually measured in terms of comparable air changes per hour. In this study, a far UVC lamp corresponds to 184 equivalent air exchanges per hour. This outperforms other approaches to disinfecting occupied indoor space. With this approach, 5 to 20 equivalent air exchanges per hour are actually the best way to achieve it.

“Our tests have produced excellent results that far exceed what is possible with ventilation alone,” he said. Kenneth WoodPhD, Lecturer and Senior Author of Physics and Astronomy at the University of St Andrews.

“In terms of preventing airborne infections, distant UVC lights can create an indoor location that is as safe as being outside a golf course on a refreshing day in St Andrews,” he said. I added.

“Previous studies have shown that far-ultraviolet C light can kill COVID virus, other human coronaviruses, influenza, and drug-resistant bacteria,” Brenner concludes.

“A particularly attractive aspect of far-ultraviolet C technology as a practical way to prevent the transmission of indoor diseases is still emerging while maintaining its effectiveness against all future COVID mutants and old-fashioned viruses. The ability to inactivate new infectious viruses that aren’t there as well, he added, “viruses like influenza and scabs.”

“Finally, because of the way UV light kills microbes, viruses and bacteria cannot develop resistance as they do with vaccines and drug treatments,” he concludes.

Source: ANI

https://www.helsinkitimes.fi/themes/themes/science-and-technology/21251-study-finds-new-type-of-uv-light-makes-indoor-air-as-safe-as-outdoors.html Studies show that new types of UV light make indoor air as safe as outdoors

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