According to the yearly report of the CDC (Center of Disease Control) Viruses, Germs, Molds, Bacteria etc. all these pathogens cause lots of different kinds of diseases and deaths to people. Every year 2.8 million antibiotic bacterial resistant infections happen and over 35.000 people die in US. On the other hand, hospital borne viruses and bacteria cause approximately 100.000 deaths yearly as in the reports of the US Department of Health & Human Services.
Traditional ways of cleaning and disinfecting brings a lot health and environment responsibilities because of the chemical ingredients inside the cleaning products. From another point of view, just like the antibiotics, flu shots, insect killers; this traditional chemical cleaning products also needs to be improved and become more toxic periodically to be able to prevent the mutated super bugs because of using the same amount of the active ingredients every single time. There are also applying processes like rubbing, brushing and even washing out etc. which we cannot apply to every single surface easily. On the other hand, they usually cannot kill the pathogens in the air.
For the last several decades there is a new professional sanitizing technology (it is technically the oldest method of them all) called UV Light Disinfection. From the beginning of the Earth, it took more than 3 billion years for early organisms called blue-green algae deep inside the oceans to produce oxygen (O2), afterwards the creation of the ozone (O3). Until ozone layer of the atmosphere has been created (which took around 1 billion year), there was no life (not even pathogens) on the lands because of the too strong UV radiations from the Sun. In this case, it seems the UV light is the most effective disinfection solutions of them all. But this topic brings some questions about what kind of UV light to use, how to use it, how much to apply it, how to make long lasting effect, how to protect humans/animals/plants from it etc.
Ultraviolet light is a portion of the electromagnetic spectrum that beyond the purple edge of the visible spectrum and has wavelengths between 100 to 400 nm. Simply, the UVA range (400-315nm) causes the sun tanning in the human skin. The UVB range (315-280nm) causes sun burning. The UVC range (280-200nm) is absorbed by DNA which breaks it down apart and thus can cause cancer and mutations. This is also the range that is most effective in inactivating bacteria and viruses. Lastly, the Vacuum UV range (200-100nm) is absorbed strongly by water and air and thus can only be transmitted in a vacuum.