How can I mitigate copper naphthenate (copper green) smell indoors?
A thick four coats of floor paint that is meant to be impermeable to damp and impervious to floor traffic helped seal in this stuff where someone used it to treat a bathroom stall against rot.

Yes, the stuff just smells horrible. It's essentially copper contaminated moth balls with a little extra phenol for sniffy goodness and not for interior use at all.