Question smoke limits

Hi guys! Hope everyone is fine and safe.

This is probably a really easy question, but i want to know how i can “blur” the borders of my smoke i dont want this really sharp borders. I just want that the smoke dissipates in the distance, im new at VFX so i dont know how to name it properly

Hope you can help me

In the volume node we have a section called “volume masking”. You can either plugin custom shapes into the volume node for the mask, or use the sliders in -Z to fade that portion. Hope this helps!