Clean air has always been the standard, but lately it's becoming much more important. Treating the air to decrease the amount of viruses and harmful microorganisms is vital these days.
Contamination can be caused by microorganisms that spread through the air. Especially in areas and rooms where the air is recirculating, the change of getting contaminated is likely to happen. When the air is being treated with UV-C radiation, the air get's disinfected. The UV-C radiation penetrates the DNA of the microorganism and inactivates it. After this process the air can be safely used.