Because sand never dries out, and there is never any dust when kids play.
Right from Quickcrete
Quote:
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QUIKRETE® Playsand is not silica free. It is a natural sand – the same as you find on the beach, at lakes and in river beds. QUIKRETE® Play Sand, and practically all other natural sands in the world, including beach, lake and river sand, contain a portion of silica sand. QUIKRETE® Play Sand is safe – it is intended for use primarily in sand boxes. We recommend that dust be controlled by keeping the sand slightly damp, since fine dust of any kind can be mildly irritating
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They recommend keeping the dust down with water, SMDH. So there is a risk of people breathing the dust, or they wouldn't mention water at all. You know baby powder used to be "safe" too, until women started getting cancer from it. Smoking was considered safe too, but that's none of my business
