I agree with the others; assuming this isn’t in a zero-gravity, windless setting, you definitely need some of your elements to come back down to earth
Also, per L-J’s reply, context here is important. Ask yourself what is exploding, and where.
The what will determine, among other things, the force/scale/speed of the initial blast.
The where will determine exactly what is being kicked up in the aftermath of the initial detonation, and how it is affected by environment (gravity, wind etc.). Are we seeing smoke, dirt, or dust? Probably all three? How do these three elements differ? On that note, to keep things simple for now, I suggest only triggering one explosion, in one location.
I could point to a ton of real world and game references, but I’m going to be lazy and let you find some for yourself if you haven’t already done so.