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Rising temperatures entice people to go out in nature. But how likely are you to get infected outside by the coronavirus?
The chance of infection in nature from the virus is significantly lower than indoors – either from the initial variant or from mutations in the virus. Aerosols in the air play a crucial role in the spread of coronavirus. According to experts outside aerosols very quickly lose the danger. “This has to do with the fact that the air circulation outside is greater. “Having wind currents, the dilution effect happens very quickly,” Nico Mutters, director of the Institute of Hygiene and Public Health at the University of Bonn Clinic, told DW. Even Birgit Wehner, an aerosol researcher at the Leibniz Institute for Troposphere Studies, says the droplets, which come out of the breathing process, dry out and dilute faster. A statement from the Association for Aerosol Studies, also signed by Wehner, said, however, that large groups of people at short distances, even in nature, could not rule out the risk of contracting the virus.
So even outside the rules of distance 1.50 to 2 meters must be observed. “If you do not keep your distance and stand face to face with each other and speak loudly, sing or spit, then you can become infected through infectious aerogens,” virologist Alexander Kekulé told DW. He is known in the media for his criticisms of government measures. According to him, the virus should be transported without being limited to the way of life.
The regulation of distance conservation must also be observed for virus mutations. “Mutants do not fly further, that is important to say,” Kekulé said. They are a little more sticky, but that makes no difference to the restrictive measures. Kisses and hugs should also be avoided. During normal movements – like a short jump side by side – there is almost no risk. Studies confirm that the risk of getting infected outside is minimal. A study from China e.g. proves, that out of 7324 registered infections only one occurred outside. The Robert Koch Institute in Germany also writes on its website that infections outside in space are very rare.
Does wind play a role in the spread of the virus?
“The more smell there is, the more the cloud of aerosols released by man is pushed,” explains physicist and aerosol researcher Gerhard Scheuch. If the distance is observed it is unlikely to have the adhesive effect of aerosols.
In an interview with DW Scheuch says that “only through the warmth of the body in the atmosphere is created a stream of air, which normally goes up like a chimney.” Because the body temperature is generally 37 degrees higher than the ambient temperature. “The warm air goes up and the aerosol cloud goes up that way.” Another study in Iran proves that air does not play a role in the transfer of infectious aerosols.
Does it matter if it is cold or warm outside?
This question has not yet received a final answer from researchers. U.S. researchers have researched infections in cold, warm, and humid regions of China and found no correlation between climatic conditions and the number of infections. While an Austrian study confirms, that ultraviolet radiation destroys viruses. “Ultraviolet radiation has a minimal effect on human-to-human infection,” say the researchers, “but the infection can occur in minutes.”
Even the experts asked by DW have different opinions. Nico Mutters notes, that it can not be said in general that in the hot season the risk is lower than in the cold season. “It is true that in summer there is a higher level of ultraviolet radiation, but the same values through reflection can be achieved in snow skiing areas. There are also infections worldwide despite the warm or cold climate in different regions. But virologist Alexander Kekulé says that infections even in warm places occur indoors and not outdoors.
Does it make sense to keep the mask off?
Outside it is reasonable to wear masks when the distance between people can not be respected. If people are dense in mass and there is no possibility of avoidance masks should be worn. Even in show or concert venues, at train and bus stations or while standing in line, experts recommend keeping your distance and wearing a mask./DW
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