Aalto University, the Finnish Meteorological Institute, VTT and the University of Helsinki have studied how extremely small aerosol particles floating in the air travel with the air flow. Aerosol particles escape from the airways when coughing, sneezing or even talking. They also carry pathogens such as coronaviruses.

According to a press release released on Monday, the researchers came to the same preliminary result: in the situation under study, the aerosol cloud also spreads to the immediate area outside the immediate vicinity of the coughing person. On the other hand, the cloud dilutes at the same time, but it takes up to minutes for the cloud to spread and dilute.

- If a cough infected with a coronavirus walks away and another person arrives near the same place, extremely small aerosol particles containing coronavirus in the air can end up in this other person's airways, says Ville Vuorinen, an assistant professor at Aalto University.

According to THL, new recommendations cannot yet be made directly on the basis of modeling.

- The preliminary results of the consortium underline the importance of our recommendations. The Department of Health and Welfare THL recommends staying at home sick and everyone taking physical distance. Our instructions are also to cough up a sleeve or handkerchief and take care of good hand hygiene, says leading expert Jussi Sane from THL, according to the press release.

More on that in a moment.