Fog is a collection of water droplets or ice crystals suspended in the air at or near the Earth's surface. It is distinguished from mist becaue it reduces visibility to less than 1 km whereas mist reduces visibility to a lesser extent.
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- Wikipedia: Fog Encyclopedia article includes the characteristics of fog, its visibility hazards and types, and photographs of some specific locations.
- Weather Online: Fog and Mist Article describing why fog occurs, how it is formed and the different types.