The currents in the wind bring microorganisms to new places and help maintain the earth's ecosystem.
A sand cloud from the Sahara can carry organisms hundreds of kilometers.
Even small dust particles carry microorganisms such as bacteria and viruses with the wind.
In some cases, they can cause illness, although it is uncommon.
Bird flu and foot-and-mouth disease can spread with the wind and infect animals from farm to farm.
- Just because we find a large number of bacteria that could be dangerous does not mean that we need to worry.
In most cases, they are dead, says Antoine Flahault, PhD in biomathematics at the University of Geneva, in the World of Science - micro-life in the air.