Seat-belt pretensioners, pyrotechnic

Lifesaving appliances include a range of articles that prevent the loss of life, particularly through drowning, or increase the chances of survival. Many lifesaving appliances contain compressed gases  

Other lifesaving equipment contains small and varied quantities of other hazardous materials  

The author was unable to find any direct reference to the use of carbon dioxide in mine rescue equipment. 

Seatbelt assemblies or seatbelt modules include the straps, webbing, buckles, adjusting mechanisms, fasteners, and related hardware designed to secure people in a vehicle to minimize risk of harm in a collision. Most modules are mechanical, but some contain a pyrotechnic or compressed gas seatbelt pretensioner which, in an emergency, forces the retractor to take up any slack in the seatbelt. 

Non-toxic gas, see Gases and Class 2, p.l04 Propellant, see Ammunition, p.8 Pyrotechnic, see Pyrotechnics and Signals, p.194 

---