Originally Posted by dvw
Agreed. And according to Matt these are sand blast particle. Aren't they abrasive? Did VD do any safety study?
If you can find out what media it is (it can be sand, glass, or metal) just do a google search + MSDS. The MSDS is the Material Safety Data Sheet lists all the possible side effects in coming into contact with said chemical or substance.
My guess would probably just be a mild lung irritant (purely guess) especially for any one with asthma and or allergies. I would not recommend vacuuming the material up either as most household vacuums don't come with HEPA filtration standard. All a vacuum will do is blow the particles back out into the air and possibly into a finer dust, also I would think sweeping would do the same thing.