Gizmodo reports scientists have discovered a specific wavelength of UV light that’s both safe for people and can kill coronaviruses, both on surfaces and in the air.<br />Researchers from Columbia University and Japan's Hiroshima University, have found that a UVC light wave of 222 nanometers does the trick.<br />It's unable to penetrate the eye’s tear layer or the dead-cell layer of skin, preventing it from reaching and damaging living cells in the human body.<br />The Columbia study found 25 minutes of exposure to the UVC light killed 99.9% of two common coronaviruses that cause colds.<br />Hiroshima University researchers confirmed that far-UVC light was effective at killing SARS-CoV-2, which is the virus that causes COVID-19.<br />They exposed a viral culture on a polystyrene plate to a far-UVC lamp at a distance of 24 centimeters, which killed 99.7% of the virus in just 30 seconds.
