Wiktionary
dustfall
n. Fine particles deposited by the atmosphere.
Usage examples of "dustfall".
Most of the dustfall must have taken place in the first few million years.
Worlds of wild magnetism and perpetual dustfall, where the surfaces of the planets are changed by the forever-shifting magnetism of their erratic orbits!
The violence of this ancient collapse has been scarcely masked by the three billion subsequent years of wind erosion and dustfall.