Cleaning service workers are seen disinfecting one of the most frequently used underpass in Warsaw. At night, the municipal cleaning services disinfect the most important and most frequently used communication routes in the center of Warsaw. Disinfection was carried out with highly ozonated water - it is an innovative Polish method. Disinfection of Warsaw was performed due to the covid 19 pandemic, the third wave of the virus is currently raging in Poland, there is a shortage of places in hospitals and the average daily number of new cases is around 30,000, while deaths are over 600. (Photo by Attila Husejnow / SOPA Images/Sipa USA)