In this way, the room air becomes corona-free
2020-07-15T15:10:29.011Z
The virus concentration is highest indoors - this carries a high risk of infection. But experts know how to keep the risk of infection indoors as low as possible.
Now you can see non-English news...
2020-07-15T15:10:29.011Z
The virus concentration is highest indoors - this carries a high risk of infection. But experts know how to keep the risk of infection indoors as low as possible.
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