Wikipedia:Picture of the day/December 29, 2005

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Picture of the day
Change in visibility due to fog in Santa Barbara, California, USA.
In meteorology, visibility is a measure of the distance that can be seen clearly at any given time. In extremely clean air in Arctic or mountainous areas, the visibility can be up to 70 to 100 km. However, visibility is often reduced somewhat by air pollution and high humidity. Various weather stations report this as haze (dry) or mist (moist). Fog and smoke can reduce visibility to near zero, making driving extremely dangerous.

Photo credit: Alan Mak
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