But at the same time, I doubt there would be much of a difference if it was dropped off a tall building.
The effects of the wind on the sand would push it everywhere, and it'd tend to breakup & just be annoying for hundreds of people when they suddenly get sand in their jocks & wonder why. Unless it was wet, then it would likely kill someone.
The water would likely disperse and again no-one would likely get very wet.
The feathers ... who could guess where they'd land?