Eliminating Odors

Eliminating Odors

Odour-free and germ-free areas through the use of UV-C/ozone or plasma-based air purifiers intended for indoor air

Scientific Background

As long ago as 1877, English scientists discovered that microorganisms no longer reproduce when exposed to sunlight.  Subsequent research proved that the invisible part of the sun’s radiation, which is between 100 and 280 nm, is responsible for this effect. Today, we know this as ultraviolet radiation with a wavelength shorter than visible light (UV-C). This discovery has made it possible to clean surfaces of solids as well as rid air of microorganisms. All this happens without the use of chemicals or high temperatures – and precisely in places that had been up until this point difficult or impossible to disinfect.


Ozone is able to combine with odor-carrying organic compounds and oxidize them. At the same time, microorganisms on surfaces – such as germs, bacteria, and mold spores – are rendered ineffective naturally, as if by the sun’s rays. The byproduct of oxidation is once again oxygen, i.e., fresh air. Because oxygen is a gas at room temperature, germs are completely destroyed in both the air as well as on surfaces –  and in hard-to-reach places that are inaccessible to chemical cleaning agents.


The UV-C ozone air purification system works on the basis of photocatalysis. It is necessary to know that this is a technology that produces clean, pure ozone combining controlled production of UV light with oxygen – a method that does not harm the environment, mimics nature, and does not produce any harmful byproducts, such as nitrogen oxides. As soon as the ozone combines with microorganisms and odor molecules outside the device itself – e.g., in the air or on surfaces such as carpets, upholstered furniture, curtains, etc. – it decomposes, and the resulting byproduct is once again oxygen. The fresh scent remaining after the air purification system’s cleaning process is similar to that of the air after a storm, which only emphasizes the naturalness of the overall air purification process.

The company oxytec makes a distinction between two types of UV-C ozone systems:

The FreshAir series, which works with only a small amount of ozone, so that the ozone created remains at levels under the threshold of 17.5 mg/h (the natural ozone concentration in the environment).

The SaniAir series – in which ozone is created to purge odors, disinfect, or do other types of quick operations – significantly exceeds this threshold value.

Whereas, when using the FreshAir series, the ozone concentration is risk-free for people and animals remaining in the space during the process, their presence is precluded when SaniAir series devices are in use.

CleanAir Plasma air purifiers were specially developed to eliminate odors in the air rather than to treat surfaces. Plasma technology works using the principles of physics and, like UV-C ozone technology, does not use chemicals. Plasma technology is a technology for treating air or circulating air during which gaseous organic carbon compounds – such as odor molecules, bacteria, and viruses – are destroyed. Solids and aerosols are eliminated in the pre-filtration phase. In contrast to UV-C ozone air purifiers, the plasma system does not emit ozone. To a greater degree, the odors are reduced by effectively pre-filtering coarse air contaminants in the room; by reactions and oxidation processes occurring when air flows through the plasma system, in which organic carbon compounds are oxidized; and in the subsequent activated carbon filter, which works as reactive storage. There, the unoxidized compounds are detained and they undergo oxidation. The activated carbon additionally changes the ozone back into oxygen. For this reason, people and animals are permitted to be present in the room when the plasma system is in operation.

In summary, both types of systems use atmospheric oxygen with a demonstrably positive effect on human health. It is with good reason that atmospheric oxygen has been used therapeutically for such a long time.

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