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Chapter 10: Game Mastering / Environment / Climate

Fog

Source Core Rulebook pg. 517 2.0
Fog imposes a circumstance penalty to visual Perception checks, depending on the thickness; it causes creatures viewed through significant amounts of fog to be concealed; and it cuts off all visibility at half a mile or less—possibly much less. Conditions limiting visibility to about a mile are called mist, and those that do so to about 3 miles are called haze.