Fog forms near the ground when water vapor condenses into tiny liquid water droplets that remain suspended in the air. It is accurate to describe fog as a cloud near the ground. Fog is usually associated with fair and calm weather, but the reduced visibility can close airports and cause numerous travel headaches. Many different processes can lead to the formation of fog, but the main criteria for fog formation is saturated air. The two ways air can become saturated are cooling the air to its dewpoint temperature or evaporating moisture into the air and increasing its water vapor content.

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