Because many of the shapes in graphical environments are relatively simple, and complex shadows are difficult to render, many graphics engines employ a "fog" gradient, so that objects further from the camera are progressively more obscured by haze. This technique works because of light scattering, which causes more distant objects to appear hazier to the eye, especially in outdoor environments.
Fogging is another use of distance fog in mid to late nineties games, where processing power wasn't enough to render far viewing distances, and clipping was employed. However, the effect could be very distracting, and by applying a medium-ranged fog, the clipped polygons would fade in more realistically from the haze, dispite the effect could be considered irrealistic in some cases. Racing and some Nintendo 64 games used this effect.
Fog is particularly hazardous at airports, where some attempts have been made to develop methods (such as using heating or spraying salt particles) to aid fog dispersal.
Salt fog (or salt-fog) is characteristic of coastal atmospheres; the water droplets of this form of fog, formed by evaporated seawater, carry in solution microscopic particles of salt.
Artificial fog is artificially generated fog that is usually created by vaporizing a water and glycol-based or glycerine-based fluid.
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