What kind of fog?

Layers of mist; Vague fog, etc. Fog is a weather phenomenon, which usually refers to a thin layer of fog formed by condensation of water vapor in the air. It can be said that "layers of mist" means that mist covers the ground layer by layer, forming a hazy scene; It can also be said that "misty mist" means that the mist is very light, as if it is floating, and it is difficult to see clearly.