One of the areas that was extensively researched in the context of Covid-19 in 2020 is the containment of viral infections indoors.

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During the pandemic, restrictions increasingly focused on what shows good results, and in the indoor context, the emphasis is consistently placed on wearing face masks and limiting the number of people indoors. It is clear that these fundamental restrictions are self-evident – masks alter the diffusion profile of human exhalation in the room, allowing the exhalation of a potentially infectious individual to diffuse in the total air mass within the smallest radius possible, while limiting the number of people makes it possible to reduce cumulative air pollution in absolute values. Studies and statistics have clearly shown that the human body is capable of protecting itself from a small number of bacteria in the air, and studies confirm a clear correlation between the severity of an individual's illness and the virus's susceptibility, which is directly related to the virus's saturation in the air. Accordingly, it can be safely stated that the indoor air ventilation regime and volume together with the use of face masks are fundamental factors in restricting the spread of the virus.

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By the way, particularly noteworthy is the scientific article published by the University of Cambridge on the use of air quality levels as a technologically easily measurable marker in assessing indoor air hazard in relation to the spread of viral infections, including Covid-19. This is one of the first tangible solutions for controlling air quality, which can also be relatively easily controlled.

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If public spaces are used during the pandemic, it is recommended to consider controlling air quality in those areas where it is not yet required by legal norms, which does not necessarily require large investments, and later these panels can be additionally integrated, for example, for controlling heating radiators.