Question: How big are silica particles, in microns?

by warren |

We're working on a simple #microscopes project with @partsandcrafts, and want to know if silica dust would be visible -- how big is it, generally?

@gretchengehrke mentioned 5 microns for "respirable airborne particles", in her post here:

Citing @mathew (Silica dust less than 5 ?m in diameter is respirable) here: https://publiclab.org/wiki/silica-monitoring#Exposure+to+silica+in+occupational+and+non-occupational+settings also linking to https://publiclab.org/wiki/pm#Respirable+Particles

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