What is the standard volume of fog formation in relation to temperature?

Fog typically forms when the air temperature and the dewpoint temperature are very close to each other, specifically within a range of approximately 2°C. This proximity indicates that the air is nearly saturated with moisture, meaning it can no longer hold additional water vapor. When the air cools to the dewpoint temperature, condensation occurs, producing fog.

This phenomenon relies on the relationship between temperature and humidity. When the temperature drops and approaches the dewpoint, the excess moisture in the air condenses into tiny water droplets, creating fog. In contrast, when the humidity is below a certain level or when the dewpoint is significantly lower than the air temperature, the conditions are not conducive to fog formation since the air would have the capacity to hold more moisture without reaching saturation. Rising air pressure generally indicates stable atmospheric conditions, which do not favor fog formation as much as a balance between temperature and dewpoint does.