A problem that has been solved for respirators meant for breathing, including in space when you don’t want to just expel the air to the surrounding environment. If it’s ok to expel it to the environment, the technology is as simple as a rubber flap over a hole in the mask.
Though reading more about it, there are mechanisms that could still cause distress even if the mask is designed to expel CO2 properly, including CO2 poisoning because the body’s ability to expel it can be compromised by the lack of oxygen. And it’s possible that executionees experience inert gas asphyxiation differently from accidental victims because they are aware of what’s happening while accidental victims might pass out without ever realizing they were dying, which can affect the way the body uses resources.
A problem that has been solved for respirators meant for breathing, including in space when you don’t want to just expel the air to the surrounding environment. If it’s ok to expel it to the environment, the technology is as simple as a rubber flap over a hole in the mask.
Though reading more about it, there are mechanisms that could still cause distress even if the mask is designed to expel CO2 properly, including CO2 poisoning because the body’s ability to expel it can be compromised by the lack of oxygen. And it’s possible that executionees experience inert gas asphyxiation differently from accidental victims because they are aware of what’s happening while accidental victims might pass out without ever realizing they were dying, which can affect the way the body uses resources.