From the Super Mario Wiki, the Mario encyclopedia
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Poison fog, also known as ash, is an obstacle first found in New Super Mario Bros. Wii, normally seen as an enormous red-and-black cloud. It normally moves to the right very slowly. It is likely based on volcanic ash.
New Super Mario Bros. Wii
Ash first appeared in New Super Mario Bros. Wii, where it is solely found in World 8-1. It can defeat the player in one hit. However, neither the volcanic debris nor the Buzzy Beetles are affected by it.
New Super Mario Bros. U / New Super Luigi U
Super Mario 3D World
Poison fog appears in Super Mario 3D World, where instead of moving right, it moves down. It also appears to generate electricity in this game. Like in past appearances, it will make the player lose a life if they touch it regardless of power-up. It appears only in Trick Trap Tower, where once it reaches the bottom, it will sink into the lava, causing it to rise. It will appear when the Key Coin at the top of the tower is collected.
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