I found this in a book that I'm reading. It says the following:
the mist was so thick, however, that visibility was down to a few yards
What does the phrase "down to a few yards" mean, taking visibility into context?
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Usually, visibility is how far a person can see, and on the clear day it is as far as the horizon, so 3.57 km, which is 3 904 yards. From the definition, a "fog" is when that visibility is only 1 093 yards. So when a mist or a fog appears, the distance of visibility, as a number of yards, goes down, from the average almost 4000 yards, to around 1000 yards.