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Closed UV radiation systems ensure that a dangerous concentration of pathogens will NEVER occur in the indoor air. When it comes to Covid-19 specifically, studies have shown that only about 10% of cases are spread through contaminated hands or touched surfaces. The main way of spreading the infection is 90% through the air, through droplets of respiratory tract secretions that people release into the environment when they sneeze, cough or sing. A minimum exposure time of 15 minutes of contact with a virus carrier is enough for infections.
Surface or mist disinfection becomes ineffective - after a virus carrier enters a room that has just been disinfected, within 15 minutes. there is a risk of getting sick again. Because the carrier exhales the virus particles in real time. The smaller the size of the droplets coughed up and sneezed out by the sick person, the longer they remain in the air and the less they are retained by various filters, including masks - but the stronger the microorganisms in such droplets are affected by UV radiation. And vice versa. The same applies to dust.
The probability of an outbreak is highest where people are in groups and spend ~15 min.. An essential measure to prevent diseases is improving indoor AIR quality. This is especially important in spaces where people eat, socialize or sing together. Therefore, schools, kindergartens, staff kitchens, meeting rooms are the most risky spaces.

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