What is needed for FOG to form?

Fog forms when water vapor in the air condenses into tiny water droplets that are suspended in the air, creating a visible cloud at ground level. For this condensation to occur, the presence of condensation nuclei is essential. These particles, which can include dust, pollen, or other small particles, provide a surface for the water vapor to condense upon. Without these nuclei, the water vapor may not effectively condense into droplets, making it difficult for fog to form.

High humidity levels contribute to fog formation as they indicate that the air is nearly saturated with moisture, and temperature changes can lead to condensation, but they are not as critical as condensation nuclei. Although strong winds can disperse fog, they are not necessary for its formation. Low temperatures can enhance the conditions for fog development, particularly through cooling the air, but again, without condensation nuclei, fog may not form regardless of temperature. Thus, the role of condensation nuclei is fundamental in the process of fog formation.