Silica dust, PM25, and asbestos are all largely inert, and cause significant health issues.

Radon is one of the noble gasses, and is chemically inert, but harmful.

<https://en.wikipedia.org/wiki/Silicosis>

<https://en.wikipedia.org/wiki/Particulate_matter#Health_effe...>

<https://en.wikipedia.org/wiki/Asbestosis>

<https://en.wikipedia.org/wiki/Radon#Health_risks>