What is respirable crystalline silica?

Last updated: 04 Mar 2020

Silica is a naturally occurring substance found in most rocks, sand and clay. It is therefore present in products such as bricks, mortar and concrete. When these materials are cut, drilled or sanded down, they create dust, some of which is fine enough to reach deep inside the lung. This is called respirable crystalline silica (RCS).

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