Arsenic based pressure treatments are unhealthy, and not commonly available anymore.
I used Copper Azole treated wood, which isn't terribly bad for you and is the type of treatment most pressure treated wood you buy at the big box stores sell now. I have more concern about toxic exhaust stink stuck on the highway at this point than any type of gassing or emission from the wood strips buried under plywood and vinyl flooring.
Originally Posted by nat_ster
Using pressure treated wood inside your bus is asking to poison yourself and loved ones.
That stuff is deadly. Please guys don't use it inside habituated spaces.