TAMPA, Fla.Theyre too small to see, but knowing they exist could play a big role in avoidingCOVID-19.
Researchers in Belgium and the Netherlands created simulations that show even if youre exercising outside, you could be exposed to the novel coronavirus through whats called a slipstream.
The droplets that are exhaled by somebody even if the person coughs or sneezes, but just exhaling is enough, said Bert Blocken, a civil engineering professor at Eindhoven University in the Netherlands.
Blocken and his team were alreadyinvestigating the movement of particles around an active body for the last eight months. When the COVID-19 pandemic erupted, scientists in Europe turned to them.
So we worked on it for two weeks, day and night, evenings and weekends, he said. We included all of the previous data we had collected from the previous months.
They found when someone is walking, running, or cycling, a vacuum or a slipstream is created, which could cause respiratory droplets to spread much farther than the prescribed six feet of social distancing.
These droplets are very light, Blocken said. They will stay behind in the airand they need time to settle down. If they dont get the time to settle down, because another person starts running behind you, the other person will simply walk through a dense cloud of droplets.
To put together their simulations, they used software to scan bodies of runners, cyclists, and walkers, and let droplets escape from their mouths as if they were breathing.
We saw how the droplets moved in the airflow around peopleand if they died down on the ground, or on the surface of another person, he said.
To avoid the droplets, they recommend staying 15 feet from others when walking, 33 feet when running or cycling at a slow pace, and 65 feet when running or cycling at a faster pace.
Based on the simulations, the study suggests one way to reduce this risk is to avoid being directly behind another person, either by running side by side or by running in a staggered formation.
The study says the droplets can evaporate quickly, but humidity plays a role, keeping the particles in the air longer, which issomething to take into account in the sunshine state.
If you are in any humid environment, it takes much longer for the droplets to evaporate, Blocken said.
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