Fog is mostly transparent. No matter where you are, there’s only a little bit of fog inbetween you and something right in front of you, so you can see it just fine. If you’re looking at something a hundred feet away, then you’re looking at it through a hundred feet of fog – even if it’s mostly transparent, lots and lots of it still adds up, so it’s tougher to see the object.
It’s the difference between looking through a single piece of plastic wrap (which looks clear even though it’s only “mostly” clear) vs. looking at a roll of plastic wrap (which looks opaque since it’s hundreds of layers deep).
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