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Panel: Properties > World Properties > Ambient Occlusion

Properties > View Layer Properties > Passes > Data > Mist をオンにすると表示される。

Mist can greatly enhance the illusion of depth in your rendering. To create mist, Blender makes objects farther away more transparent (decreasing their Alpha value) so that they mix more of the background color with the object color. With Mist enabled the further the object is away from the camera the less its alpha value will be.

Shown when the Mist pass is enabled. Mist values will range from 0.0 - 1.0 and are available from the Render Layers node.

Mist Pass

Start

The distance from the camera at which the mist starts to fade in.

Depth

The distance from Start of the mist, that it fades in over. Objects further from the camera than Start + Depth are completely hidden by the mist.

Falloff

The curve function that controls the rate of change of the mist’s strength further and further into the distance.

Quadratic

Uses the same calculation as light falloff (1/x²) and provides the smoothest transition from transparent (0.0) to opaque (1.0).

Linear

Has a steeper start than quadratic (1/x).

Inverse Quadratic

Has the steepest start (1/√x) and approaches 1.0 faster than the other two functions.

ｉTip

A visualization can be activated in the Camera ‣ Display panel.
Properties > Camera Properties > Viewport Display???

ｉTip

Because Mist works by adjusting transparency, this can sometimes cause objects to be partially transparent when they should not be. One workaround is to set the Mist settings as desired, but turn Mist off. The Mist data is still available for compositing even though it is off. Use Compositing to feed the Mist pass to the Alpha Over node to blend the background color (or a render layer with just the sky) with the rendered image. This produces the mist effect but since Mist is off the object transparency (or lack of) is preserved.
Compositing
Alpha Over Node