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Pathfinder really needs a greater variation of categories for natural fog conditions. Saying, "fog obscures all sight beyond 5 feet" is to much.
Perhaps three categories would be better:
1) "Natural" Fog: Normal visibility out to 60', 20% concealment from 60 to 120 and fog obscures all sight beyond 120'
2) "Natural" Thick fog: Normal visibility out to 30', 20% concealment from 30 to 60 and fog obscures all sight beyond 60'
3) "Natural" Heavy Ground or Tully fog: 20% concealment out to 5' and fog obscures all sight beyond 5'.
We can have these rules in a home game, but not in a Pathfinder Society game. For example, "Silent Tide" says in the first paragraph read to the players, "A thick fog hangs in the air". When you say a thick fog hangs in the air in a PSS module, we DM's have to ignore it (which we do) or have PC's walking around blind through the whole adventure. Though I might be able to get away with my "natural fog" rule above during a home game, but at a convention I would simply ignore the fog except for the unnatural fog in the module.
Scott.