Simple Fog is an add-on for generating volumetric effects in Blender scenes. It features a one-click setup that automatically adds a volumetric cube configured with prebuilt settings to the environment. The tool includes three customizable presets: a dramatic ground-level fog, a subtle atmospheric haze, and procedural cloudscapes designed for wide or aerial shots. It also features an organized shader node group, which includes specific controls like a procedural fire slider for additional customization.