Which gases can cause suffocation or respiratory issues?

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Asphyxiating gases are the ones that can cause suffocation or breathing problems because they reduce the amount of oxygen available to the body or interfere with how oxygen is used. In an enclosed space, gases like nitrogen or argon can displace breathable air, so you may start feeling dizzy, short of breath, confused, or even lose consciousness as oxygen levels drop. Even high concentrations of carbon dioxide can create a hypoxic environment, leading to similar symptoms.

Other categories aren’t as directly tied to suffocation. Toxic gases cause harm mainly through chemical toxicity to the lungs or blood, rather than primarily by removing oxygen. Flammable gases are hazardous mainly for fire or explosion risks, not for causing immediate breathing problems. Noble gases are inert, and while they can pose an asphyxiation risk if they fill a space and push out oxygen, the term that most directly describes the risk of suffocation is asphyxiating gases.