Breathing apprentices are hard to find. Thinking apprentices even more so. Those that will show up to work are exceedingly rare these days. And those that are literate and can spell? Practically nonexistent. Evidently.
Wouldn't a commonly available painter's mask apparatus with replaceable screw-on carbon canister cartridges work? Like the ones used when painting catalyzed paint?
3m makes a really nice full face mask, and get the organic vapor filters for it. yes its alittle pricey, but the mask should last years, and the filters should also.https://www.amazon.com/3M-Facepiece-Reusable-Respirator-54159-x/dp/B007JZ1M10/ref=sr_1_1_sspa?ie=UTF8&qid=1548555242&sr=8-1-spons&keywords=3m+full+face+respirator&psc=1