There is no fixed or uniform level for ambient noise as it depends on various factors such as the type of scene, the desired effect and the personal style of the sound engineer. However, in general, the volume of the atmosphere should be adjusted to support the scene without drowning out dialogue or other important elements. A common approach is to keep ambient noise at a level where it is clearly audible but does not become too dominant. This allows the viewer to perceive the surroundings without being distracted. It is also important to pay attention to the mix between atmosphere, dialogue and other sound effects in order to achieve a balanced sound image PGM to achieve. Ultimately, the optimal volume depends on the scene and the creative decisions of the sound engineers.