I've been playing with my little home brew CNC router cutting some plastic
enclosures and have noticed my eyes are a little sore/gritty afterwards.

I think the enclosures I've been machining are either polystyrene or
polycarbonate, I'm using a straight sided 2 flute 2mm router bit in a Dremel
at about 10,000RPM. The cuts are pretty clean with no melting or burning
that I can see.

Has anyone any experience with this? Perhaps I just need more ventillation?