In this unreal engine 5.3 tutorial we’re using Niagara Fluids to create a volumetric, real-time simulation of heavy smoke. The tutorial serves as an overall introduction to Niagara Fluids and is suitable even for absolute beginners to Niagara.
https://dev.epicgames.com/community/learning/tutorials/6Bk2/niagara-fluids-beginner-tutorial-cryogenic-smoke-vfx-in-unreal-engine-5-3-redefinefx