How does UVC light kill the new coronavirus?
The effective wavelength range of ultraviolet disinfection can be divided into the
following 4 bands:
Ultraviolet rays have high energy and can destroy the DNA and RNA structure of
and cause the genetic material in microorganisms such as viruses and bacteria to break,
crosslink or form photochemical products.
At the same time, ultraviolet rays can also act on oxygen atoms in cells to form
lethal active oxygen free radicals, which can cause microbial cells to fail to proliferate or
In addition, ultraviolet rays with a wavelength of about 185nm can also act on oxygen
in the air to produce ozone with strong oxidizing effect, and can also achieve the purpose of
killing viruses and bacteria.
In general, ultraviolet rays can use their own high energy to destroy the structure of
a variety of microorganisms, and can also generate ozone in the air, and use ozone to kill
The culprit of this epidemic-the genetic material of the new coronavirus COVID-19 is
RNA. Ultraviolet rays can act on the genetic material of the virus, causing the RNA of the virus
to break, making it unable to synthesize the required protein normally, thereby killing the
Far-UVC Light Safely Kills Airborne Coronaviruses
More than 99.9% of seasonal coronaviruses present in airborne droplets were killed
when exposed to a particular wavelength of ultraviolet light that is safe to use around humans,
a new study
at Columbia University Irving Medical Center has found.
"Based on our results,continuous
airborne disinfection with far-UVC
light at the current regulatory limit
could greatly reduce the level of
airborne virus in indoor
environments occupied by people."
“Based on our results, continuous airborne disinfection with far-UVC light at the current
regulatory limit could greatly reduce the level of airborne virus in indoor environments occupied by
people,” says the study’s lead author David Brenner, PhD, Higgins Professor of Radiation Biophysics
at Columbia University Vagelos College of Physicians and Surgeons and director of the Center for
Radiological Research at Columbia University Irving Medical Center.