The authors created a computer model of the distribution of pollen: a willow was taken as a sample.
They made a complete 3D model of a tree that emits 10 thousand pollen particles in a weak wind (about 4 km/h), and also studied how the air flow interacts with a small number of 11 people, and a relatively large crowd of up to 100 people.
As a result, it turned out that pollen significantly accelerated the spread of coronavirus, even if the wind speed outside was minimal.
Pollen grains carry SARS-CoV-2 particles six meters or more. Under normal conditions, they fly no more than two meters.
In the event of a high concentration of pollen grains in the air or during flowering in spring, a social distance of 2 m is not a safety measure for people outdoors. Thus, public authorities must rethink the principles of social distancing.
Scientists have concluded that the tandem of pollen and the virus caused last year’s summer surges in the spread of COVID-19 in parts of the United States and Europe.