[sbaiddn]

Nothing thats nano is inert.

That being said even inert things can act as catalysts, and even if they don't act as catalysts, they can sterically interfere with reactions

[adrr]

I assume we eat lots of dust especially if you live in a dry climate next to a desert.

[sbaiddn]

But its not nano

[adrr]

https://academic.oup.com/toxres/article/11/4/565/6645393

Has the sources of silica nano particles.