A quote from my FAM (Flight Attendant Manual)
"Personal smoke hoods. The smoke hood is not considered a dangerous good as long as it meets the following criteria:
- It uses an inert filtration device, usually contained in a canister or other holding device.
- it contains NO compressed gas of any sort.
- it does not use a chemical reaction to produce oxygen."
I'm sure this would be standard in the aviation industry.
Hope that's what you were looking for!