* Altitude: Fog is formed near the ground, while other types of clouds are formed higher in the atmosphere.
* Visibility: Fog reduces visibility, while other types of clouds do not.
* Composition: Fog is composed of water droplets or ice crystals, while other types of clouds can be composed of different materials, such as dust or smoke.
* Formation: Fog is formed when water vapor condenses into liquid water or ice crystals, while other types of clouds are formed when water vapor condenses into liquid water or ice crystals that then freeze.
Fog can be a hazard to navigation, especially in the air and on the water. It can also cause respiratory problems, especially for people with asthma or other respiratory conditions.
