Linked from
The 17 pages that link to Fog, each with the reason it gives.
Dew pointRelated: Fog forms when near-surface air cools to saturation, often reaching its dew point.
VisibilityRelated: Fog is a common cause of sharply reduced visibility at the surface.
Great Smoky MountainsRelated: Frequent fog forms as moist air cools over the mountains.
Lake MashūRelated: Fog frequently obscures Mashū's surface and surrounding crater rim.