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Stone dust is not dust - it's small-sized stones of different shapes and sizes made out of limestone that interlock to form a firm, cohesive surface, that's somewhat permeable. It doesn't fly off into the atmosphere. The residents are experiencing some other phenomenon - maybe the result of construction or clear cutting that has been done around the reservoir. A topnotch well-made aggregate stone surface holds up very well and doesn't fly apart. There are places that give the right formula, the right combination of ingredients. Also limestone aggregate stone does not release silica, something I've heard some people say. Silica is in soil not limestone.