Fog World Mod
Fog World Mod 1.18.1, 1.12.2 adds configurable fog to the Minecraft world. This mod is intended for modpack creators or players who want to control Minecraft fog. Using the configuration options you can change the fog density (thickness) and the fog color. You can also blacklist certain biomes and dimensions from spawning with fog.
Fog World also has the option of making the fog poisonous on direct contact, this is disabled by default but can be enabled in the config along with a few options to control the delay before damaging the player and damage amount dealt to the player by the fog.
Screenshots:
Orange fog in a Taiga biome
Fog in the Nether
Requires:
How to install:
How To Download & Install Mods with Minecraft Forge
How To Download & Install Fabric Mods