The primary means of UV propagation over short distances relies on line-of-sight; if there are no obstructions or sufficient height, it can extend for tens to hundreds of kilometers.
Even if the distance is short, if there's too much obstruction, such as in a basement, it might be impossible to get through.
Therefore, one location might not be suitable; it's possible to move to a different location nearby (or even a different room, which could make a significant difference).
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