Fog forms at humidity values less than 100 percent

Question

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Fog forms when the temperature of the air is lowered to its dew point and water vapor condenses onto tiny particles in the air, known as condensation nuclei. If the concentration of these nuclei is relatively small, the air can become supersaturated with water vapor, leading to the formation of fog. Humidity values of less than 100 percent indicate that the air has not yet reached saturation, so the presence of a sufficient number of condensation nuclei is crucial for fog formation. Fog can form over any area where these conditions are met, not just over ocean areas or swampy regions.

Fog Forms at Humidity Values Less Than 100 Percent